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class="vector-toc-list"> <li id="toc-Autonomic_control" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Autonomic_control"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.1</span> <span>Autonomic control</span> </div> </a> <ul id="toc-Autonomic_control-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Voluntary_and_involuntary_control" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Voluntary_and_involuntary_control"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.2</span> <span>Voluntary and involuntary control</span> </div> </a> <ul id="toc-Voluntary_and_involuntary_control-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Nocturnal_erection" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Nocturnal_erection"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.3</span> <span>Nocturnal erection</span> </div> </a> <ul id="toc-Nocturnal_erection-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Socio-sexual_aspects" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Socio-sexual_aspects"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Socio-sexual aspects</span> </div> </a> <button aria-controls="toc-Socio-sexual_aspects-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Socio-sexual aspects subsection</span> </button> <ul id="toc-Socio-sexual_aspects-sublist" class="vector-toc-list"> <li id="toc-Social" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Social"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.1</span> <span>Social</span> </div> </a> <ul id="toc-Social-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Spontaneous_or_random_erections" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Spontaneous_or_random_erections"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.2</span> <span>Spontaneous or random erections</span> </div> </a> <ul id="toc-Spontaneous_or_random_erections-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Size" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Size"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.3</span> <span>Size</span> </div> </a> <ul id="toc-Size-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Direction" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Direction"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.4</span> <span>Direction</span> </div> </a> <ul id="toc-Direction-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Medical_conditions" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Medical_conditions"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Medical conditions</span> </div> </a> <button aria-controls="toc-Medical_conditions-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Medical conditions subsection</span> </button> <ul id="toc-Medical_conditions-sublist" class="vector-toc-list"> <li id="toc-Erectile_dysfunction" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Erectile_dysfunction"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.1</span> <span>Erectile dysfunction</span> </div> </a> <ul id="toc-Erectile_dysfunction-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Priapism" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Priapism"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.2</span> <span>Priapism</span> </div> </a> <ul id="toc-Priapism-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Hard_flaccid_syndrome" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Hard_flaccid_syndrome"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.3</span> <span>Hard flaccid syndrome</span> </div> </a> <ul id="toc-Hard_flaccid_syndrome-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Other_animals" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Other_animals"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Other animals</span> </div> </a> <ul id="toc-Other_animals-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Terminology" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Terminology"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>Terminology</span> </div> </a> <ul id="toc-Terminology-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-See_also" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#See_also"> <div class="vector-toc-text"> <span class="vector-toc-numb">6</span> <span>See also</span> </div> </a> <ul id="toc-See_also-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-References" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#References"> <div class="vector-toc-text"> <span class="vector-toc-numb">7</span> <span>References</span> </div> </a> <ul id="toc-References-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Contents" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" title="Table of Contents" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Toggle the table of contents" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">Toggle the table of contents</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Erection</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Go to an article in another language. Available in 78 languages" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-78" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">78 languages</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-af mw-list-item"><a href="https://af.wikipedia.org/wiki/Ereksie" title="Ereksie – Afrikaans" lang="af" hreflang="af" data-title="Ereksie" data-language-autonym="Afrikaans" data-language-local-name="Afrikaans" class="interlanguage-link-target"><span>Afrikaans</span></a></li><li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D8%A7%D9%86%D8%AA%D8%B5%D8%A7%D8%A8_%D8%A7%D9%84%D9%82%D8%B6%D9%8A%D8%A8" title="انتصاب القضيب – Arabic" lang="ar" hreflang="ar" data-title="انتصاب القضيب" data-language-autonym="العربية" data-language-local-name="Arabic" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-an mw-list-item"><a href="https://an.wikipedia.org/wiki/Erecci%C3%B3n" title="Erección – Aragonese" lang="an" hreflang="an" data-title="Erección" data-language-autonym="Aragonés" data-language-local-name="Aragonese" class="interlanguage-link-target"><span>Aragonés</span></a></li><li class="interlanguage-link interwiki-as mw-list-item"><a href="https://as.wikipedia.org/wiki/%E0%A6%B2%E0%A6%BF%E0%A6%82%E0%A6%97_%E0%A6%B8%E0%A7%8D%E0%A6%A4%E0%A6%AE%E0%A7%8D%E0%A6%AD%E0%A6%A8" title="লিংগ স্তম্ভন – Assamese" lang="as" hreflang="as" data-title="লিংগ স্তম্ভন" data-language-autonym="অসমীয়া" data-language-local-name="Assamese" class="interlanguage-link-target"><span>অসমীয়া</span></a></li><li class="interlanguage-link interwiki-gn mw-list-item"><a href="https://gn.wikipedia.org/wiki/Temboat%C3%A3" title="Temboatã – Guarani" lang="gn" hreflang="gn" data-title="Temboatã" data-language-autonym="Avañe'ẽ" data-language-local-name="Guarani" class="interlanguage-link-target"><span>Avañe'ẽ</span></a></li><li class="interlanguage-link interwiki-az mw-list-item"><a href="https://az.wikipedia.org/wiki/Ereksiya" title="Ereksiya – Azerbaijani" lang="az" hreflang="az" data-title="Ereksiya" data-language-autonym="Azərbaycanca" data-language-local-name="Azerbaijani" class="interlanguage-link-target"><span>Azərbaycanca</span></a></li><li class="interlanguage-link interwiki-bn mw-list-item"><a href="https://bn.wikipedia.org/wiki/%E0%A6%B2%E0%A6%BF%E0%A6%99%E0%A7%8D%E0%A6%97%E0%A7%8B%E0%A6%A4%E0%A7%8D%E0%A6%A5%E0%A6%BE%E0%A6%A8" title="লিঙ্গোত্থান – Bangla" lang="bn" hreflang="bn" data-title="লিঙ্গোত্থান" data-language-autonym="বাংলা" data-language-local-name="Bangla" class="interlanguage-link-target"><span>বাংলা</span></a></li><li class="interlanguage-link interwiki-bjn mw-list-item"><a href="https://bjn.wikipedia.org/wiki/Canggar" title="Canggar – Banjar" lang="bjn" hreflang="bjn" data-title="Canggar" data-language-autonym="Banjar" data-language-local-name="Banjar" class="interlanguage-link-target"><span>Banjar</span></a></li><li class="interlanguage-link interwiki-be mw-list-item"><a href="https://be.wikipedia.org/wiki/%D0%AD%D1%80%D1%8D%D0%BA%D1%86%D1%8B%D1%8F" title="Эрэкцыя – Belarusian" lang="be" hreflang="be" data-title="Эрэкцыя" data-language-autonym="Беларуская" data-language-local-name="Belarusian" class="interlanguage-link-target"><span>Беларуская</span></a></li><li class="interlanguage-link interwiki-be-x-old mw-list-item"><a href="https://be-tarask.wikipedia.org/wiki/%D0%AD%D1%80%D1%8D%D0%BA%D1%86%D1%8B%D1%8F" title="Эрэкцыя – Belarusian (Taraškievica orthography)" lang="be-tarask" hreflang="be-tarask" data-title="Эрэкцыя" data-language-autonym="Беларуская (тарашкевіца)" data-language-local-name="Belarusian (Taraškievica orthography)" class="interlanguage-link-target"><span>Беларуская (тарашкевіца)</span></a></li><li class="interlanguage-link interwiki-bcl mw-list-item"><a href="https://bcl.wikipedia.org/wiki/Pagla%27tog" title="Pagla'tog – Central Bikol" lang="bcl" hreflang="bcl" data-title="Pagla'tog" data-language-autonym="Bikol Central" data-language-local-name="Central Bikol" class="interlanguage-link-target"><span>Bikol Central</span></a></li><li class="interlanguage-link interwiki-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/%D0%95%D1%80%D0%B5%D0%BA%D1%86%D0%B8%D1%8F" title="Ерекция – Bulgarian" lang="bg" hreflang="bg" data-title="Ерекция" data-language-autonym="Български" data-language-local-name="Bulgarian" class="interlanguage-link-target"><span>Български</span></a></li><li class="interlanguage-link interwiki-bo mw-list-item"><a href="https://bo.wikipedia.org/wiki/%E0%BD%80%E0%BD%BA%E0%BD%A2%E0%BC%8B%E0%BD%A3%E0%BD%84%E0%BD%A6%E0%BC%8D" title="ཀེར་ལངས། – Tibetan" lang="bo" hreflang="bo" data-title="ཀེར་ལངས།" data-language-autonym="བོད་ཡིག" data-language-local-name="Tibetan" class="interlanguage-link-target"><span>བོད་ཡིག</span></a></li><li class="interlanguage-link interwiki-bs mw-list-item"><a href="https://bs.wikipedia.org/wiki/Erekcija" title="Erekcija – Bosnian" lang="bs" hreflang="bs" data-title="Erekcija" data-language-autonym="Bosanski" data-language-local-name="Bosnian" class="interlanguage-link-target"><span>Bosanski</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Erecci%C3%B3" title="Erecció – Catalan" lang="ca" hreflang="ca" data-title="Erecció" data-language-autonym="Català" data-language-local-name="Catalan" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Erekce" title="Erekce – Czech" lang="cs" hreflang="cs" data-title="Erekce" data-language-autonym="Čeština" data-language-local-name="Czech" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-cy mw-list-item"><a href="https://cy.wikipedia.org/wiki/Codiad" title="Codiad – Welsh" lang="cy" hreflang="cy" data-title="Codiad" data-language-autonym="Cymraeg" data-language-local-name="Welsh" class="interlanguage-link-target"><span>Cymraeg</span></a></li><li class="interlanguage-link interwiki-da mw-list-item"><a href="https://da.wikipedia.org/wiki/Erektion" title="Erektion – Danish" lang="da" hreflang="da" data-title="Erektion" data-language-autonym="Dansk" data-language-local-name="Danish" class="interlanguage-link-target"><span>Dansk</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Erektion" title="Erektion – German" lang="de" hreflang="de" data-title="Erektion" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-dv mw-list-item"><a href="https://dv.wikipedia.org/wiki/%DE%86%DE%AE%DE%85%DE%AA%DE%88%DE%AA%DE%82%DE%B0" title="ކޮޅުވުން – Divehi" lang="dv" hreflang="dv" data-title="ކޮޅުވުން" data-language-autonym="ދިވެހިބަސް" data-language-local-name="Divehi" class="interlanguage-link-target"><span>ދިވެހިބަސް</span></a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/Erektsioon" title="Erektsioon – Estonian" lang="et" hreflang="et" data-title="Erektsioon" data-language-autonym="Eesti" data-language-local-name="Estonian" class="interlanguage-link-target"><span>Eesti</span></a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/%CE%A3%CF%84%CF%8D%CF%83%CE%B7" title="Στύση – Greek" lang="el" hreflang="el" data-title="Στύση" data-language-autonym="Ελληνικά" data-language-local-name="Greek" class="interlanguage-link-target"><span>Ελληνικά</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Erecci%C3%B3n" title="Erección – Spanish" lang="es" hreflang="es" data-title="Erección" data-language-autonym="Español" data-language-local-name="Spanish" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-eo mw-list-item"><a href="https://eo.wikipedia.org/wiki/Erekti%C4%9Do" title="Erektiĝo – Esperanto" lang="eo" hreflang="eo" data-title="Erektiĝo" data-language-autonym="Esperanto" data-language-local-name="Esperanto" class="interlanguage-link-target"><span>Esperanto</span></a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/Erekzio" title="Erekzio – Basque" lang="eu" hreflang="eu" data-title="Erekzio" data-language-autonym="Euskara" data-language-local-name="Basque" class="interlanguage-link-target"><span>Euskara</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D9%86%D8%B9%D9%88%D8%B8" title="نعوظ – Persian" lang="fa" hreflang="fa" data-title="نعوظ" data-language-autonym="فارسی" data-language-local-name="Persian" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/%C3%89rection" title="Érection – French" lang="fr" hreflang="fr" data-title="Érection" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-fy mw-list-item"><a href="https://fy.wikipedia.org/wiki/Ereksje" title="Ereksje – Western Frisian" lang="fy" hreflang="fy" data-title="Ereksje" data-language-autonym="Frysk" data-language-local-name="Western Frisian" class="interlanguage-link-target"><span>Frysk</span></a></li><li class="interlanguage-link interwiki-gl mw-list-item"><a href="https://gl.wikipedia.org/wiki/Erecci%C3%B3n" title="Erección – Galician" lang="gl" hreflang="gl" data-title="Erección" data-language-autonym="Galego" data-language-local-name="Galician" class="interlanguage-link-target"><span>Galego</span></a></li><li class="interlanguage-link interwiki-gu mw-list-item"><a href="https://gu.wikipedia.org/wiki/%E0%AA%B2%E0%AA%BF%E0%AA%82%E0%AA%97_%E0%AA%89%E0%AA%A4%E0%AB%8D%E0%AA%A5%E0%AA%BE%E0%AA%A8" title="લિંગ ઉત્થાન – Gujarati" lang="gu" hreflang="gu" data-title="લિંગ ઉત્થાન" data-language-autonym="ગુજરાતી" data-language-local-name="Gujarati" class="interlanguage-link-target"><span>ગુજરાતી</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EB%B0%9C%EA%B8%B0" title="발기 – Korean" lang="ko" hreflang="ko" data-title="발기" data-language-autonym="한국어" data-language-local-name="Korean" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/%D4%B7%D6%80%D5%A5%D5%AF%D6%81%D5%AB%D5%A1" title="Էրեկցիա – Armenian" lang="hy" hreflang="hy" data-title="Էրեկցիա" data-language-autonym="Հայերեն" data-language-local-name="Armenian" class="interlanguage-link-target"><span>Հայերեն</span></a></li><li class="interlanguage-link interwiki-hi mw-list-item"><a href="https://hi.wikipedia.org/wiki/%E0%A4%B8%E0%A5%8D%E0%A4%A4%E0%A4%82%E0%A4%AD%E0%A4%A8" title="स्तंभन – Hindi" lang="hi" hreflang="hi" data-title="स्तंभन" data-language-autonym="हिन्दी" data-language-local-name="Hindi" class="interlanguage-link-target"><span>हिन्दी</span></a></li><li class="interlanguage-link interwiki-hr mw-list-item"><a href="https://hr.wikipedia.org/wiki/Erekcija" title="Erekcija – Croatian" lang="hr" hreflang="hr" data-title="Erekcija" data-language-autonym="Hrvatski" data-language-local-name="Croatian" class="interlanguage-link-target"><span>Hrvatski</span></a></li><li class="interlanguage-link interwiki-io mw-list-item"><a href="https://io.wikipedia.org/wiki/Erekto" title="Erekto – Ido" lang="io" hreflang="io" data-title="Erekto" data-language-autonym="Ido" data-language-local-name="Ido" class="interlanguage-link-target"><span>Ido</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Ereksi" title="Ereksi – Indonesian" lang="id" hreflang="id" data-title="Ereksi" data-language-autonym="Bahasa Indonesia" data-language-local-name="Indonesian" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-is mw-list-item"><a href="https://is.wikipedia.org/wiki/Standp%C3%ADna" title="Standpína – Icelandic" lang="is" hreflang="is" data-title="Standpína" data-language-autonym="Íslenska" data-language-local-name="Icelandic" class="interlanguage-link-target"><span>Íslenska</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Erezione" title="Erezione – Italian" lang="it" hreflang="it" data-title="Erezione" data-language-autonym="Italiano" data-language-local-name="Italian" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/%D7%96%D7%A7%D7%A4%D7%94" title="זקפה – Hebrew" lang="he" hreflang="he" data-title="זקפה" data-language-autonym="עברית" data-language-local-name="Hebrew" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-jv mw-list-item"><a href="https://jv.wikipedia.org/wiki/Ereksi" title="Ereksi – Javanese" lang="jv" hreflang="jv" data-title="Ereksi" data-language-autonym="Jawa" data-language-local-name="Javanese" class="interlanguage-link-target"><span>Jawa</span></a></li><li class="interlanguage-link interwiki-lv mw-list-item"><a href="https://lv.wikipedia.org/wiki/Erekcija" title="Erekcija – Latvian" lang="lv" hreflang="lv" data-title="Erekcija" data-language-autonym="Latviešu" data-language-local-name="Latvian" class="interlanguage-link-target"><span>Latviešu</span></a></li><li class="interlanguage-link interwiki-lt mw-list-item"><a href="https://lt.wikipedia.org/wiki/Erekcija" title="Erekcija – Lithuanian" lang="lt" hreflang="lt" data-title="Erekcija" data-language-autonym="Lietuvių" data-language-local-name="Lithuanian" class="interlanguage-link-target"><span>Lietuvių</span></a></li><li class="interlanguage-link interwiki-lfn mw-list-item"><a href="https://lfn.wikipedia.org/wiki/Erije" title="Erije – Lingua Franca Nova" lang="lfn" hreflang="lfn" data-title="Erije" data-language-autonym="Lingua Franca Nova" data-language-local-name="Lingua Franca Nova" class="interlanguage-link-target"><span>Lingua Franca Nova</span></a></li><li class="interlanguage-link interwiki-lmo mw-list-item"><a href="https://lmo.wikipedia.org/wiki/Erezion" title="Erezion – Lombard" lang="lmo" hreflang="lmo" data-title="Erezion" data-language-autonym="Lombard" data-language-local-name="Lombard" class="interlanguage-link-target"><span>Lombard</span></a></li><li class="interlanguage-link interwiki-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/Erekci%C3%B3" title="Erekció – Hungarian" lang="hu" hreflang="hu" data-title="Erekció" data-language-autonym="Magyar" data-language-local-name="Hungarian" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-mk mw-list-item"><a href="https://mk.wikipedia.org/wiki/%D0%95%D1%80%D0%B5%D0%BA%D1%86%D0%B8%D1%98%D0%B0" title="Ерекција – Macedonian" lang="mk" hreflang="mk" data-title="Ерекција" data-language-autonym="Македонски" data-language-local-name="Macedonian" class="interlanguage-link-target"><span>Македонски</span></a></li><li class="interlanguage-link interwiki-ml mw-list-item"><a href="https://ml.wikipedia.org/wiki/%E0%B4%89%E0%B4%A6%E0%B5%8D%E0%B4%A7%E0%B4%BE%E0%B4%B0%E0%B4%A3%E0%B4%82" title="ഉദ്ധാരണം – Malayalam" lang="ml" hreflang="ml" data-title="ഉദ്ധാരണം" data-language-autonym="മലയാളം" data-language-local-name="Malayalam" class="interlanguage-link-target"><span>മലയാളം</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Erectie" title="Erectie – Dutch" lang="nl" hreflang="nl" data-title="Erectie" data-language-autonym="Nederlands" data-language-local-name="Dutch" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E5%8B%83%E8%B5%B7" title="勃起 – Japanese" lang="ja" hreflang="ja" data-title="勃起" data-language-autonym="日本語" data-language-local-name="Japanese" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Ereksjon" title="Ereksjon – Norwegian Bokmål" lang="nb" hreflang="nb" data-title="Ereksjon" data-language-autonym="Norsk bokmål" data-language-local-name="Norwegian Bokmål" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-nn mw-list-item"><a href="https://nn.wikipedia.org/wiki/Ereksjon" title="Ereksjon – Norwegian Nynorsk" lang="nn" hreflang="nn" data-title="Ereksjon" data-language-autonym="Norsk nynorsk" data-language-local-name="Norwegian Nynorsk" class="interlanguage-link-target"><span>Norsk nynorsk</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Erekcja_(fizjologia)" title="Erekcja (fizjologia) – Polish" lang="pl" hreflang="pl" data-title="Erekcja (fizjologia)" data-language-autonym="Polski" data-language-local-name="Polish" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Ere%C3%A7%C3%A3o" title="Ereção – Portuguese" lang="pt" hreflang="pt" data-title="Ereção" data-language-autonym="Português" data-language-local-name="Portuguese" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ro mw-list-item"><a href="https://ro.wikipedia.org/wiki/Erec%C8%9Bia_penisului" title="Erecția penisului – Romanian" lang="ro" hreflang="ro" data-title="Erecția penisului" data-language-autonym="Română" data-language-local-name="Romanian" class="interlanguage-link-target"><span>Română</span></a></li><li class="interlanguage-link interwiki-qu mw-list-item"><a href="https://qu.wikipedia.org/wiki/Ullu_k%27aspiyay" title="Ullu k'aspiyay – Quechua" lang="qu" hreflang="qu" data-title="Ullu k'aspiyay" data-language-autonym="Runa Simi" data-language-local-name="Quechua" class="interlanguage-link-target"><span>Runa Simi</span></a></li><li class="interlanguage-link interwiki-ru badge-Q17437798 badge-goodarticle mw-list-item" title="good article badge"><a href="https://ru.wikipedia.org/wiki/%D0%AD%D1%80%D0%B5%D0%BA%D1%86%D0%B8%D1%8F" title="Эрекция – Russian" lang="ru" hreflang="ru" data-title="Эрекция" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-sah mw-list-item"><a href="https://sah.wikipedia.org/wiki/%D0%91%D1%83%D1%87%D1%87%D0%B0_%D1%82%D1%83%D1%80%D1%83%D1%83%D1%82%D0%B0" title="Бучча туруута – Yakut" lang="sah" hreflang="sah" data-title="Бучча туруута" data-language-autonym="Саха тыла" data-language-local-name="Yakut" class="interlanguage-link-target"><span>Саха тыла</span></a></li><li class="interlanguage-link interwiki-sco badge-Q70893996 mw-list-item" title=""><a href="https://sco.wikipedia.org/wiki/Erection" title="Erection – Scots" lang="sco" hreflang="sco" data-title="Erection" data-language-autonym="Scots" data-language-local-name="Scots" class="interlanguage-link-target"><span>Scots</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Erection" title="Erection – Simple English" lang="en-simple" hreflang="en-simple" data-title="Erection" data-language-autonym="Simple English" data-language-local-name="Simple English" class="interlanguage-link-target"><span>Simple English</span></a></li><li class="interlanguage-link interwiki-sk mw-list-item"><a href="https://sk.wikipedia.org/wiki/Erekcia_(%C4%8Dlovek)" title="Erekcia (človek) – Slovak" lang="sk" hreflang="sk" data-title="Erekcia (človek)" data-language-autonym="Slovenčina" data-language-local-name="Slovak" class="interlanguage-link-target"><span>Slovenčina</span></a></li><li class="interlanguage-link interwiki-sl mw-list-item"><a href="https://sl.wikipedia.org/wiki/Erekcija" title="Erekcija – Slovenian" lang="sl" hreflang="sl" data-title="Erekcija" data-language-autonym="Slovenščina" data-language-local-name="Slovenian" class="interlanguage-link-target"><span>Slovenščina</span></a></li><li class="interlanguage-link interwiki-ckb mw-list-item"><a href="https://ckb.wikipedia.org/wiki/%DA%95%DB%95%D9%BE%D8%A8%D9%88%D9%88%D9%86%DB%8C_%DA%A9%DB%8E%D8%B1" title="ڕەپبوونی کێر – Central Kurdish" lang="ckb" hreflang="ckb" data-title="ڕەپبوونی کێر" data-language-autonym="کوردی" data-language-local-name="Central Kurdish" class="interlanguage-link-target"><span>کوردی</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/%D0%95%D1%80%D0%B5%D0%BA%D1%86%D0%B8%D1%98%D0%B0" title="Ерекција – Serbian" lang="sr" hreflang="sr" data-title="Ерекција" data-language-autonym="Српски / srpski" data-language-local-name="Serbian" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-sh mw-list-item"><a href="https://sh.wikipedia.org/wiki/Erekcija" title="Erekcija – Serbo-Croatian" lang="sh" hreflang="sh" data-title="Erekcija" data-language-autonym="Srpskohrvatski / српскохрватски" data-language-local-name="Serbo-Croatian" class="interlanguage-link-target"><span>Srpskohrvatski / српскохрватски</span></a></li><li class="interlanguage-link interwiki-su mw-list-item"><a href="https://su.wikipedia.org/wiki/Celegeng" title="Celegeng – Sundanese" lang="su" hreflang="su" data-title="Celegeng" data-language-autonym="Sunda" data-language-local-name="Sundanese" class="interlanguage-link-target"><span>Sunda</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Erektio" title="Erektio – Finnish" lang="fi" hreflang="fi" data-title="Erektio" data-language-autonym="Suomi" data-language-local-name="Finnish" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Erektion" title="Erektion – Swedish" lang="sv" hreflang="sv" data-title="Erektion" data-language-autonym="Svenska" data-language-local-name="Swedish" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-tl mw-list-item"><a href="https://tl.wikipedia.org/wiki/Paninigas_at_pagtayo_ng_titi" title="Paninigas at pagtayo ng titi – Tagalog" lang="tl" hreflang="tl" data-title="Paninigas at pagtayo ng titi" data-language-autonym="Tagalog" data-language-local-name="Tagalog" class="interlanguage-link-target"><span>Tagalog</span></a></li><li class="interlanguage-link interwiki-ta mw-list-item"><a href="https://ta.wikipedia.org/wiki/%E0%AE%B5%E0%AE%BF%E0%AE%B1%E0%AF%88%E0%AE%AA%E0%AF%8D%E0%AE%AA%E0%AF%81%E0%AE%A4%E0%AF%8D_%E0%AE%A4%E0%AF%82%E0%AE%95%E0%AF%8D%E0%AE%95%E0%AE%B2%E0%AF%8D" title="விறைப்புத் தூக்கல் – Tamil" lang="ta" hreflang="ta" data-title="விறைப்புத் தூக்கல்" data-language-autonym="தமிழ்" data-language-local-name="Tamil" class="interlanguage-link-target"><span>தமிழ்</span></a></li><li class="interlanguage-link interwiki-te mw-list-item"><a href="https://te.wikipedia.org/wiki/%E0%B0%85%E0%B0%82%E0%B0%97%E0%B0%B8%E0%B1%8D%E0%B0%A4%E0%B0%82%E0%B0%AD%E0%B0%A8" title="అంగస్తంభన – Telugu" lang="te" hreflang="te" data-title="అంగస్తంభన" data-language-autonym="తెలుగు" data-language-local-name="Telugu" class="interlanguage-link-target"><span>తెలుగు</span></a></li><li class="interlanguage-link interwiki-th mw-list-item"><a href="https://th.wikipedia.org/wiki/%E0%B8%81%E0%B8%B2%E0%B8%A3%E0%B9%81%E0%B8%82%E0%B9%87%E0%B8%87%E0%B8%95%E0%B8%B1%E0%B8%A7%E0%B8%82%E0%B8%AD%E0%B8%87%E0%B8%AD%E0%B8%87%E0%B8%84%E0%B8%8A%E0%B8%B2%E0%B8%95" title="การแข็งตัวขององคชาต – Thai" lang="th" hreflang="th" data-title="การแข็งตัวขององคชาต" data-language-autonym="ไทย" data-language-local-name="Thai" class="interlanguage-link-target"><span>ไทย</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Sertle%C5%9Fme" title="Sertleşme – Turkish" lang="tr" hreflang="tr" data-title="Sertleşme" data-language-autonym="Türkçe" data-language-local-name="Turkish" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%95%D1%80%D0%B5%D0%BA%D1%86%D1%96%D1%8F" title="Ерекція – Ukrainian" lang="uk" hreflang="uk" data-title="Ерекція" data-language-autonym="Українська" data-language-local-name="Ukrainian" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-ur mw-list-item"><a href="https://ur.wikipedia.org/wiki/%D8%A7%DB%8C%D8%B3%D8%AA%D8%A7%D8%AF%DA%AF%DB%8C" title="ایستادگی – Urdu" lang="ur" hreflang="ur" data-title="ایستادگی" data-language-autonym="اردو" data-language-local-name="Urdu" class="interlanguage-link-target"><span>اردو</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/C%C6%B0%C6%A1ng_c%E1%BB%A9ng" title="Cương cứng – Vietnamese" lang="vi" hreflang="vi" data-title="Cương cứng" data-language-autonym="Tiếng Việt" data-language-local-name="Vietnamese" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-wuu mw-list-item"><a href="https://wuu.wikipedia.org/wiki/%E5%8B%83%E8%B5%B7" title="勃起 – Wu" lang="wuu" hreflang="wuu" data-title="勃起" data-language-autonym="吴语" data-language-local-name="Wu" class="interlanguage-link-target"><span>吴语</span></a></li><li class="interlanguage-link interwiki-zh-yue mw-list-item"><a href="https://zh-yue.wikipedia.org/wiki/%E6%89%AF%E6%97%97_(%E7%94%9F%E7%90%86)" title="扯旗 (生理) – Cantonese" lang="yue" hreflang="yue" data-title="扯旗 (生理)" 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//upload.wikimedia.org/wikipedia/en/thumb/1/1b/Semi-protection-shackle.svg/40px-Semi-protection-shackle.svg.png 2x" data-file-width="512" data-file-height="512" /></a></span></div></div> </div> <div id="siteSub" class="noprint">From Wikipedia, the free encyclopedia</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">Physiological phenomenon involving the hardening and enlargement of the penis</div> <style data-mw-deduplicate="TemplateStyles:r1236090951">.mw-parser-output .hatnote{font-style:italic}.mw-parser-output div.hatnote{padding-left:1.6em;margin-bottom:0.5em}.mw-parser-output .hatnote i{font-style:normal}.mw-parser-output .hatnote+link+.hatnote{margin-top:-0.5em}@media print{body.ns-0 .mw-parser-output .hatnote{display:none!important}}</style><div role="note" class="hatnote navigation-not-searchable">This article is about penile erection. For the similar arousal in females, see <a href="/wiki/Clitoral_erection" title="Clitoral erection">clitoral erection</a>. For other uses, see <a href="/wiki/Erection_(disambiguation)" class="mw-disambig" title="Erection (disambiguation)">Erection (disambiguation)</a>.</div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Not to be confused with <a href="/wiki/Penis_enlargement" title="Penis enlargement">penis enlargement</a>.</div> <p class="mw-empty-elt"> </p> <style data-mw-deduplicate="TemplateStyles:r1257001546">.mw-parser-output .infobox-subbox{padding:0;border:none;margin:-3px;width:auto;min-width:100%;font-size:100%;clear:none;float:none;background-color:transparent}.mw-parser-output .infobox-3cols-child{margin:auto}.mw-parser-output .infobox .navbar{font-size:100%}@media screen{html.skin-theme-clientpref-night .mw-parser-output .infobox-full-data:not(.notheme)>div:not(.notheme)[style]{background:#1f1f23!important;color:#f8f9fa}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .infobox-full-data:not(.notheme) div:not(.notheme){background:#1f1f23!important;color:#f8f9fa}}@media(min-width:640px){body.skin--responsive .mw-parser-output .infobox-table{display:table!important}body.skin--responsive .mw-parser-output .infobox-table>caption{display:table-caption!important}body.skin--responsive .mw-parser-output .infobox-table>tbody{display:table-row-group}body.skin--responsive .mw-parser-output .infobox-table tr{display:table-row!important}body.skin--responsive .mw-parser-output .infobox-table th,body.skin--responsive .mw-parser-output .infobox-table td{padding-left:inherit;padding-right:inherit}}</style><table class="infobox"><tbody><tr><th colspan="2" class="infobox-above" style="background-color:dimgray; color: white">Erection</th></tr><tr><td colspan="2" class="infobox-image"><span typeof="mw:File"><a href="/wiki/File:A_Erect_human_penis.JPG" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/4/46/A_Erect_human_penis.JPG/270px-A_Erect_human_penis.JPG" decoding="async" width="270" height="203" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/46/A_Erect_human_penis.JPG/405px-A_Erect_human_penis.JPG 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/46/A_Erect_human_penis.JPG/540px-A_Erect_human_penis.JPG 2x" data-file-width="4000" data-file-height="3000" /></a></span><div class="infobox-caption">Erection of an uncircumcised male human</div></td></tr><tr><td colspan="2" class="infobox-image"><span typeof="mw:File"><a href="/wiki/File:Figure_28_01_06.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/1/11/Figure_28_01_06.jpg/270px-Figure_28_01_06.jpg" decoding="async" width="270" height="248" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/11/Figure_28_01_06.jpg/405px-Figure_28_01_06.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/11/Figure_28_01_06.jpg/540px-Figure_28_01_06.jpg 2x" data-file-width="781" data-file-height="718" /></a></span><div class="infobox-caption">Three columns of erectile tissue make up most of the volume of the penis.</div></td></tr><tr><th colspan="2" class="infobox-header" style="background-color: #efefef">Identifiers</th></tr><tr><th scope="row" class="infobox-label" style="padding-right:0.25em"><a href="/wiki/Medical_Subject_Headings" title="Medical Subject Headings">MeSH</a></th><td class="infobox-data"><a rel="nofollow" class="external text" href="https://meshb.nlm.nih.gov/record/ui?ui=D010410">D010410</a></td></tr><tr><th scope="row" class="infobox-label" style="padding-right:0.25em"><a href="/wiki/Terminologia_Embryologica" title="Terminologia Embryologica">TE</a></th><td class="infobox-data"><a rel="nofollow" class="external text" href="https://ifaa.unifr.ch/Public/EntryPage/THE/TE2010V1.pdf#page=1?note=Linked_from_Erection_by_E1.0.0.0.0.0.8">E1.0.0.0.0.0.8 </a></td></tr><tr><td colspan="2" class="infobox-below"><a href="/wiki/Anatomical_terminology" title="Anatomical terminology">Anatomical terminology</a><div style="text-align: right;"><small class="noprint">[<a href="https://www.wikidata.org/wiki/Q133993" class="extiw" title="d:Q133993">edit on Wikidata</a>]</small></div></td></tr></tbody></table> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1257001546"><table class="infobox"><tbody><tr><th colspan="2" class="infobox-above" style="background-color:dimgray; color: white">Erection blood vessels</th></tr><tr><th colspan="2" class="infobox-header" style="background-color: #efefef">Identifiers</th></tr><tr><th scope="row" class="infobox-label" style="padding-right:0.25em"><a href="/wiki/Medical_Subject_Headings" title="Medical Subject Headings">MeSH</a></th><td class="infobox-data"><a rel="nofollow" class="external text" href="https://meshb.nlm.nih.gov/record/ui?ui=D010410">D010410</a></td></tr><tr><th scope="row" class="infobox-label" style="padding-right:0.25em"><a href="/wiki/Terminologia_Embryologica" title="Terminologia Embryologica">TE</a></th><td class="infobox-data"><a rel="nofollow" class="external text" href="https://ifaa.unifr.ch/Public/EntryPage/THE/TE2010V1.pdf#page=1?note=Linked_from_Erection_by_E1.0.0.0.0.0.8">E1.0.0.0.0.0.8 </a></td></tr><tr><td colspan="2" class="infobox-below"><a href="/wiki/Anatomical_terminology" title="Anatomical terminology">Anatomical terminology</a><div style="text-align: right;"><small class="noprint">[<a href="https://www.wikidata.org/wiki/Q133993" class="extiw" title="d:Q133993">edit on Wikidata</a>]</small></div></td></tr></tbody></table> <p>An <b>erection</b> (clinically: <b>penile erection</b> or <b>penile tumescence</b>) is a <a href="/wiki/Physiology" title="Physiology">physiological</a> phenomenon in which the <a href="/wiki/Penis" title="Penis">penis</a> becomes firm, engorged, and enlarged. Penile erection is the result of a complex interaction of psychological, neural, vascular, and endocrine factors, and is often associated with <a href="/wiki/Sexual_arousal" title="Sexual arousal">sexual arousal</a>, <a href="/wiki/Sexual_attraction" title="Sexual attraction">sexual attraction</a> or <a href="/wiki/Libido" title="Libido">libido</a>, although erections can also be spontaneous. The shape, angle, and direction of an erection vary considerably between humans. </p><p>Physiologically, an erection is required for a male to effect penetration or <a href="/wiki/Sexual_intercourse" title="Sexual intercourse">sexual intercourse</a> and is triggered by the <a href="/wiki/Parasympathetic" class="mw-redirect" title="Parasympathetic">parasympathetic</a> division of the <a href="/wiki/Autonomic_nervous_system" title="Autonomic nervous system">autonomic nervous system</a>, causing the levels of <a href="/wiki/Nitric_oxide" title="Nitric oxide">nitric oxide</a> (a <a href="/wiki/Vasodilation" title="Vasodilation">vasodilator</a>) to rise in the <a href="/wiki/Trabeculae_of_corpora_cavernosa_of_penis" title="Trabeculae of corpora cavernosa of penis">trabecular</a> <a href="/wiki/Artery" title="Artery">arteries</a> and <a href="/wiki/Smooth_muscle" title="Smooth muscle">smooth muscle</a> of the penis. The arteries <a href="/wiki/Vasodilation" title="Vasodilation">dilate</a> causing the <a href="/wiki/Corpus_cavernosum_penis" title="Corpus cavernosum penis">corpora cavernosa</a> of the penis (and to a lesser extent the <a href="/wiki/Corpus_spongiosum" class="mw-redirect" title="Corpus spongiosum">corpus spongiosum</a>) to fill with <a href="/wiki/Blood" title="Blood">blood</a>; simultaneously the <a href="/wiki/Ischiocavernosus_muscle" title="Ischiocavernosus muscle">ischiocavernosus</a> and <a href="/wiki/Bulbospongiosus_muscle" title="Bulbospongiosus muscle">bulbospongiosus</a> muscles compress the <a href="/wiki/Vein" title="Vein">veins</a> of the corpora cavernosa restricting the egress and circulation of this blood. Erection subsides when parasympathetic activity reduces to baseline. </p><p>As an autonomic nervous system response, an erection may result from a variety of stimuli, including <a href="/wiki/Sexual_stimulation" title="Sexual stimulation">sexual stimulation</a> and <a href="/wiki/Sexual_arousal" title="Sexual arousal">sexual arousal</a>, and is therefore not entirely under conscious control. Erections during sleep or upon waking up are known as <a href="/wiki/Nocturnal_penile_tumescence" title="Nocturnal penile tumescence">nocturnal penile tumescence</a> (NPT), also known as "morning wood". Absence of nocturnal erection is commonly used to distinguish between physical and psychological causes of <a href="/wiki/Erectile_dysfunction" title="Erectile dysfunction">erectile dysfunction</a> and <a href="/wiki/Impotence" class="mw-redirect" title="Impotence">impotence</a>. </p><p>The state of a penis which is partly, but not fully, erect is sometimes known as semi-erection (clinically: <b>partial tumescence</b>); a penis which is not erect is typically referred to as being flaccid, or soft. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Physiology">Physiology</h2></div> <style data-mw-deduplicate="TemplateStyles:r1273380762/mw-parser-output/.tmulti">.mw-parser-output .tmulti .multiimageinner{display:flex;flex-direction:column}.mw-parser-output .tmulti .trow{display:flex;flex-direction:row;clear:left;flex-wrap:wrap;width:100%;box-sizing:border-box}.mw-parser-output .tmulti .tsingle{margin:1px;float:left}.mw-parser-output .tmulti .theader{clear:both;font-weight:bold;text-align:center;align-self:center;background-color:transparent;width:100%}.mw-parser-output .tmulti .thumbcaption{background-color:transparent}.mw-parser-output .tmulti .text-align-left{text-align:left}.mw-parser-output .tmulti .text-align-right{text-align:right}.mw-parser-output .tmulti .text-align-center{text-align:center}@media all and (max-width:720px){.mw-parser-output .tmulti .thumbinner{width:100%!important;box-sizing:border-box;max-width:none!important;align-items:center}.mw-parser-output .tmulti .trow{justify-content:center}.mw-parser-output .tmulti .tsingle{float:none!important;max-width:100%!important;box-sizing:border-box;text-align:center}.mw-parser-output .tmulti .tsingle .thumbcaption{text-align:left}.mw-parser-output .tmulti .trow>.thumbcaption{text-align:center}}@media screen{html.skin-theme-clientpref-night .mw-parser-output .tmulti .multiimageinner span:not(.skin-invert-image):not(.skin-invert):not(.bg-transparent) img{background-color:white}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .tmulti .multiimageinner span:not(.skin-invert-image):not(.skin-invert):not(.bg-transparent) img{background-color:white}}</style><div class="thumb tmulti tright"><div class="thumbinner multiimageinner" style="width:262px;max-width:262px"><div class="trow"><div class="theader">Erection stages</div></div><div class="trow"><div class="tsingle" style="width:260px;max-width:260px"><div class="thumbimage" style="height:157px;overflow:hidden"><span typeof="mw:File"><a href="/wiki/File:Erection_Development_V2.jpg" class="mw-file-description"><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/e/e7/Erection_Development_V2.jpg/258px-Erection_Development_V2.jpg" decoding="async" width="258" height="158" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/e7/Erection_Development_V2.jpg/387px-Erection_Development_V2.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/e7/Erection_Development_V2.jpg/516px-Erection_Development_V2.jpg 2x" data-file-width="1408" data-file-height="860" /></a></span></div></div></div><div class="trow"><div class="tsingle" style="width:260px;max-width:260px"><div class="thumbimage" style="height:258px;overflow:hidden"><span typeof="mw:File"><a href="/wiki/File:Circumcised_human_penis_erection_stages.jpg" class="mw-file-description"><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d2/Circumcised_human_penis_erection_stages.jpg/258px-Circumcised_human_penis_erection_stages.jpg" decoding="async" width="258" height="258" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d2/Circumcised_human_penis_erection_stages.jpg/387px-Circumcised_human_penis_erection_stages.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d2/Circumcised_human_penis_erection_stages.jpg/516px-Circumcised_human_penis_erection_stages.jpg 2x" data-file-width="1890" data-file-height="1890" /></a></span></div></div></div><div class="trow"><div class="tsingle" style="width:260px;max-width:260px"><div class="thumbimage" style="height:223px;overflow:hidden"><span typeof="mw:File"><a href="/wiki/File:Different_penis_sizes.jpg" class="mw-file-description"><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/8/85/Different_penis_sizes.jpg/258px-Different_penis_sizes.jpg" decoding="async" width="258" height="223" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/85/Different_penis_sizes.jpg/387px-Different_penis_sizes.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/85/Different_penis_sizes.jpg/516px-Different_penis_sizes.jpg 2x" data-file-width="1030" data-file-height="892" /></a></span></div></div></div><div class="trow"><div class="tsingle" style="width:260px;max-width:260px"><div class="thumbimage" style="height:129px;overflow:hidden"><span typeof="mw:File"><a href="/wiki/File:Lateral_view_of_an_un-circumcised_human_penis_during_various_stages_of_erection.png" class="mw-file-description"><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Lateral_view_of_an_un-circumcised_human_penis_during_various_stages_of_erection.png/258px-Lateral_view_of_an_un-circumcised_human_penis_during_various_stages_of_erection.png" decoding="async" width="258" height="129" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Lateral_view_of_an_un-circumcised_human_penis_during_various_stages_of_erection.png/387px-Lateral_view_of_an_un-circumcised_human_penis_during_various_stages_of_erection.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Lateral_view_of_an_un-circumcised_human_penis_during_various_stages_of_erection.png/516px-Lateral_view_of_an_un-circumcised_human_penis_during_various_stages_of_erection.png 2x" data-file-width="4096" data-file-height="2048" /></a></span></div></div></div><div class="trow" style="display:flex"><div class="thumbcaption">Side views and comparison of the stages of both uncircumcised and circumcised human penis erection</div></div></div></div> <p>An erection is necessary for <a href="/wiki/Insemination" title="Insemination">natural insemination</a> as well as for the harvesting of sperm for <a href="/wiki/Artificial_insemination" title="Artificial insemination">artificial insemination</a>, and is common for children and infants. After reaching <a href="/wiki/Puberty" title="Puberty">puberty</a>, erections occur much more frequently.<sup id="cite_ref-Madaras2007_1-0" class="reference"><a href="#cite_note-Madaras2007-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> An erection occurs when two tubular structures, called the <a href="/wiki/Corpus_cavernosum_penis" title="Corpus cavernosum penis">corpora cavernosa</a>, that run the length of the penis, become engorged with <a href="/wiki/Venous_blood" title="Venous blood">venous blood</a>. This may result from any of various <a href="/wiki/Physiology" title="Physiology">physiological</a> stimuli, also known as <a href="/wiki/Sexual_stimulation" title="Sexual stimulation">sexual stimulation</a> and <a href="/wiki/Sexual_arousal" title="Sexual arousal">sexual arousal</a>. The <a href="/wiki/Corpus_spongiosum" class="mw-redirect" title="Corpus spongiosum">corpus spongiosum</a> is a single tubular structure located just below the corpora cavernosa, which contains the <a href="/wiki/Urethra" title="Urethra">urethra</a>, through which <a href="/wiki/Urine" title="Urine">urine</a> and <a href="/wiki/Semen" title="Semen">semen</a> pass during <a href="/wiki/Urination" title="Urination">urination</a> and <a href="/wiki/Ejaculation" title="Ejaculation">ejaculation</a> respectively. This may also become slightly engorged with blood, but less so than the corpora cavernosa. </p><p>In some cases, the scrotum becomes tightened during an erection, and in most uncircumcised males, the <a href="/wiki/Foreskin" title="Foreskin">foreskin</a> automatically and gradually retracts throughout the various stages of erection, exposing the <a href="/wiki/Glans_penis" title="Glans penis">glans</a>, though some individuals have to manually retract their foreskin. </p> <div class="mw-heading mw-heading3"><h3 id="Autonomic_control">Autonomic control</h3></div> <p>In the presence of mechanical stimulation, erection is initiated by the <a href="/wiki/Parasympathetic" class="mw-redirect" title="Parasympathetic">parasympathetic</a> division of the <a href="/wiki/Autonomic_nervous_system" title="Autonomic nervous system">autonomic nervous system</a> with minimal input from the <a href="/wiki/Central_nervous_system" title="Central nervous system">central nervous system</a>. Parasympathetic branches extend from the <a href="/wiki/Sacral_plexus" title="Sacral plexus">sacral plexus</a> into the <a href="/wiki/Arteries" class="mw-redirect" title="Arteries">arteries</a> supplying the erectile tissue; upon stimulation, these nerve branches release <a href="/wiki/Acetylcholine" title="Acetylcholine">acetylcholine</a>, which in turn causes the release of <a href="/wiki/Nitric_oxide" title="Nitric oxide">nitric oxide</a> from <a href="/wiki/Endothelial_cell" class="mw-redirect" title="Endothelial cell">endothelial cells</a> in the <a href="/wiki/Trabeculae_of_corpora_cavernosa_of_penis" title="Trabeculae of corpora cavernosa of penis">trabecular</a> arteries.<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> Nitric oxide diffuses to the <a href="/wiki/Smooth_muscle" title="Smooth muscle">smooth muscle</a> of the arteries (called <i>trabecular smooth muscle</i><sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup>), acting as a <a href="/wiki/Vasodilation" title="Vasodilation">vasodilating</a> agent.<sup id="cite_ref-Marieb_5-0" class="reference"><a href="#cite_note-Marieb-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> The arteries dilate, filling the <i>corpus spongiosum</i> and <i>corpora cavernosa</i> with blood. The <a href="/wiki/Ischiocavernosus_muscle" title="Ischiocavernosus muscle">ischiocavernosus</a> and <a href="/wiki/Bulbospongiosus_muscle" title="Bulbospongiosus muscle">bulbospongiosus</a> muscles also compress the veins of the corpora cavernosa, limiting the venous drainage of blood.<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> Erection subsides when parasympathetic stimulation is discontinued; baseline stimulation from the <a href="/wiki/Sympathetic_nervous_system" title="Sympathetic nervous system">sympathetic division</a> of the autonomic nervous system causes constriction of the <a href="/wiki/Penile_artery" title="Penile artery">penile arteries</a> and cavernosal sinosoids, forcing blood out of the erectile tissue through erection-related veins which include one deep dorsal vein, a pair of cavernosal veins, and two pairs of para-arterial veins between Buck's fascia and the tunica albuginea.<sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Penis_Structure,_Encyclopedia_of_Reproduction_8-0" class="reference"><a href="#cite_note-Penis_Structure,_Encyclopedia_of_Reproduction-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> Erection rigidity is mechanically controlled by reduction blood flow through theses veins, and thereby building up the pressure of the corpus cavernosum and corpus spongiosum, an integral instructure, the distal ligament, buttresses the glans penis.<sup id="cite_ref-Penis_Structure-Erection,_Encyclopedia_of_Reproduction_9-0" class="reference"><a href="#cite_note-Penis_Structure-Erection,_Encyclopedia_of_Reproduction-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> </p><p>After <a href="/wiki/Ejaculation" title="Ejaculation">ejaculation</a> or cessation of stimulation, erection usually subsides, but the time taken may vary depending on the length and thickness of the penis.<sup id="cite_ref-10" class="reference"><a href="#cite_note-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Voluntary_and_involuntary_control">Voluntary and involuntary control</h3></div> <p>The <a href="/wiki/Cerebral_cortex" title="Cerebral cortex">cerebral cortex</a> can initiate erection in the absence of direct mechanical stimulation (in response to visual, auditory, olfactory, imagined, or tactile stimuli) acting through erectile centers in the lumbar and sacral regions of the <a href="/wiki/Spinal_cord" title="Spinal cord">spinal cord</a>.<sup id="cite_ref-11" class="reference"><a href="#cite_note-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> The cortex may suppress erection, even in the presence of mechanical stimulation, as may other psychological, emotional, and environmental factors.<sup id="cite_ref-12" class="reference"><a href="#cite_note-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Nocturnal_erection">Nocturnal erection</h3></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Nocturnal_penile_tumescence" title="Nocturnal penile tumescence">Nocturnal penile tumescence</a></div> <p>The penis may become erect during sleep or be erect on waking up. Such an erection is medically known as <a href="/wiki/Nocturnal_penile_tumescence" title="Nocturnal penile tumescence">nocturnal penile tumescence</a> (informally: <i>morning wood</i> or <i>morning glory</i>).<sup id="cite_ref-13" class="reference"><a href="#cite_note-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-14" class="reference"><a href="#cite_note-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-15" class="reference"><a href="#cite_note-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-16" class="reference"><a href="#cite_note-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Socio-sexual_aspects">Socio-sexual aspects</h2></div> <div class="mw-heading mw-heading3"><h3 id="Social">Social</h3></div> <p>Though an erection can have many causes, it is most commonly seen as an indicator of <a href="/wiki/Sexual_arousal" title="Sexual arousal">sexual arousal</a> and is therefore considered taboo or inappropriate for a public setting in many societies. This taboo is lesser than that surrounding <a href="/wiki/Public_sex" title="Public sex">public sex</a> but higher than that surrounding <a href="/wiki/Nudity" title="Nudity">nudity</a>. Erectile dysfunction is often considered a flaw, eliciting shame in individuals affected. </p><p>The <a href="/wiki/Penile_plethysmograph" class="mw-redirect" title="Penile plethysmograph">penile plethysmograph</a>, which measures erections, has been used by some governments and <a href="/wiki/Court" title="Court">courts of law</a> to measure sexual orientation. An unusual aversion to the erect penis is sometimes referred to as <a href="/wiki/Phallophobia" title="Phallophobia">phallophobia</a>. </p> <div class="mw-heading mw-heading3"><h3 id="Spontaneous_or_random_erections">Spontaneous or random erections</h3></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1273380762/mw-parser-output/.tmulti"><div class="thumb tmulti tright"><div class="thumbinner multiimageinner" style="width:192px;max-width:192px"><div class="trow"><div class="tsingle" style="width:190px;max-width:190px"><div class="thumbimage" style="height:135px;overflow:hidden"><span typeof="mw:File"><a href="/wiki/File:A_male_wearing_fishnet_underpants_(cropped).jpg" class="mw-file-description"><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/a/ac/A_male_wearing_fishnet_underpants_%28cropped%29.jpg/188px-A_male_wearing_fishnet_underpants_%28cropped%29.jpg" decoding="async" width="188" height="135" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/ac/A_male_wearing_fishnet_underpants_%28cropped%29.jpg/282px-A_male_wearing_fishnet_underpants_%28cropped%29.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/ac/A_male_wearing_fishnet_underpants_%28cropped%29.jpg/376px-A_male_wearing_fishnet_underpants_%28cropped%29.jpg 2x" data-file-width="2311" data-file-height="1660" /></a></span></div></div></div><div class="trow"><div class="tsingle" style="width:190px;max-width:190px"><div class="thumbimage" style="height:186px;overflow:hidden"><span typeof="mw:File"><a href="/wiki/File:Visible_erection_through_clothing.jpg" class="mw-file-description"><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/cb/Visible_erection_through_clothing.jpg/188px-Visible_erection_through_clothing.jpg" decoding="async" width="188" height="187" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/cb/Visible_erection_through_clothing.jpg/282px-Visible_erection_through_clothing.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/cb/Visible_erection_through_clothing.jpg/376px-Visible_erection_through_clothing.jpg 2x" data-file-width="1843" data-file-height="1829" /></a></span></div></div></div><div class="trow" style="display:flex"><div class="thumbcaption">Erection visible beneath clothing</div></div></div></div> <p>Spontaneous erections, also known as involuntary, random or unwanted erections, are commonplace and a normal part of male physiology. Socially, such erections can be <a href="/wiki/Embarrassment" title="Embarrassment">embarrassing</a> if they happen in public or when undesired.<sup id="cite_ref-Madaras2007_1-1" class="reference"><a href="#cite_note-Madaras2007-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> Such erections can occur at any time of day, and if clothed may cause a bulge which (if required) can be disguised or hidden by wearing close-fitting underwear, a long shirt, or baggier clothes.<sup id="cite_ref-Attwood2008_17-0" class="reference"><a href="#cite_note-Attwood2008-17"><span class="cite-bracket">[</span>17<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Size">Size</h3></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Human_penis_size" title="Human penis size">Human penis size</a></div> <p>The length of the flaccid penis is not indicative of the length of the penis when it becomes erect, with some smaller flaccid penises growing much longer, and some larger flaccid penises growing comparatively less.<sup id="cite_ref-kinsey_18-0" class="reference"><a href="#cite_note-kinsey-18"><span class="cite-bracket">[</span>18<span class="cite-bracket">]</span></a></sup> Generally, the size of an erect penis is fixed throughout post-<a href="/wiki/Puberty" title="Puberty">pubescent</a> life. Its size may be increased by surgery.<sup id="cite_ref-19" class="reference"><a href="#cite_note-19"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup> </p><p>Though the size of a penis varies considerably between males, the average length of an erect <a href="/wiki/Human_penis" title="Human penis">human penis</a> is 13.12 cm (5.17 inches), while the average circumference of an erect human penis is 11.66 cm (4.59 inches).<sup id="cite_ref-20" class="reference"><a href="#cite_note-20"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Direction">Direction</h3></div> <p>Although many erect penises point upwards, it is common and normal for the erect penis to point nearly vertically upwards or horizontally straight forward or even nearly vertically downwards, all depending on the tension of the suspensory ligament that holds it in position. An erect penis can also take on a number of different shapes, ranging from a straight tube to a tube with a curvature up or down or to the left or right. An increase in penile curvature can be caused by <a href="/wiki/Peyronie%27s_disease" title="Peyronie's disease">Peyronie's disease</a>. This may cause physical and psychological effects for the affected individual, which could include <a href="/wiki/Erectile_dysfunction" title="Erectile dysfunction">erectile dysfunction</a> or pain during an erection. Treatments include oral medication (such as <a href="/wiki/Colchicine" title="Colchicine">colchicine</a>) or surgery, which is most often performed only as a last resort. The following table shows how common various erection angles are for a standing male. In the table, zero degrees (0°) is pointing straight up against the abdomen, 90° is horizontal and pointing straight forward, and 180° is pointing straight down to the feet. An upward pointing angle is most common and the average erection angle is 74.3 degrees. The penile curvature was measured same time. 63% men have straight penis. 22.2% men have upwards curvature and 14.8% men have downwards curvature.<sup id="cite_ref-21" class="reference"><a href="#cite_note-21"><span class="cite-bracket">[</span>21<span class="cite-bracket">]</span></a></sup> </p> <table class="wikitable"> <caption>Occurrence of erection angles </caption> <tbody><tr> <th>Angle (°) </th> <th>Percent of population </th></tr> <tr> <td>0–30 </td> <td>4.9 </td></tr> <tr> <td>30–60 </td> <td>29.6 </td></tr> <tr> <td>60–85 </td> <td>30.9 </td></tr> <tr> <td>85–95 </td> <td>9.9 </td></tr> <tr> <td>95–120 </td> <td>19.8 </td></tr> <tr> <td>120–180 </td> <td>4.9 </td></tr></tbody></table> <div class="mw-heading mw-heading2"><h2 id="Medical_conditions">Medical conditions</h2></div> <div class="mw-heading mw-heading3"><h3 id="Erectile_dysfunction">Erectile dysfunction</h3></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Erectile_dysfunction" title="Erectile dysfunction">Erectile dysfunction</a></div> <p>Erectile dysfunction (also known as ED or "(male) impotence") is a <a href="/wiki/Sexual_dysfunction" title="Sexual dysfunction">sexual dysfunction</a> characterized by the inability to develop and/or maintain an erection.<sup id="cite_ref-22" class="reference"><a href="#cite_note-22"><span class="cite-bracket">[</span>22<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-pmid16828320_23-0" class="reference"><a href="#cite_note-pmid16828320-23"><span class="cite-bracket">[</span>23<span class="cite-bracket">]</span></a></sup> The study of erectile dysfunction within medicine is known as <a href="/wiki/Andrology" title="Andrology">andrology</a>, a sub-field within <a href="/wiki/Urology" title="Urology">urology</a>.<sup id="cite_ref-24" class="reference"><a href="#cite_note-24"><span class="cite-bracket">[</span>24<span class="cite-bracket">]</span></a></sup> </p><p>Erectile dysfunction may occur due to <a href="/wiki/Physiological" class="mw-redirect" title="Physiological">physiological</a> or <a href="/wiki/Psychological" class="mw-redirect" title="Psychological">psychological</a> reasons, most of which are amenable to treatment. Common physiological reasons include diabetes, kidney disease, chronic alcoholism, multiple sclerosis, atherosclerosis, vascular disease, including arterial insufficiency and venogenic erectile dysfunction,<sup id="cite_ref-Erection_Abnormality,_Encyclopedia_of_Reproduction_25-0" class="reference"><a href="#cite_note-Erection_Abnormality,_Encyclopedia_of_Reproduction-25"><span class="cite-bracket">[</span>25<span class="cite-bracket">]</span></a></sup> and neurologic disease which collectively account for about 70% of ED cases.<sup id="cite_ref-Marieb_5-1" class="reference"><a href="#cite_note-Marieb-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> Some drugs used to treat other conditions, such as <a href="/wiki/Lithium_(medication)" title="Lithium (medication)">lithium</a> and <a href="/wiki/Paroxetine" title="Paroxetine">paroxetine</a>, may cause erectile dysfunction.<sup id="cite_ref-pmid16828320_23-1" class="reference"><a href="#cite_note-pmid16828320-23"><span class="cite-bracket">[</span>23<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-26" class="reference"><a href="#cite_note-26"><span class="cite-bracket">[</span>26<span class="cite-bracket">]</span></a></sup> </p><p>Erectile dysfunction, tied closely as it is to cultural notions of <a href="/wiki/Virility" title="Virility">potency</a>, <a href="/wiki/Social_status" title="Social status">success</a> and <a href="/wiki/Masculinity" title="Masculinity">masculinity</a>, can have devastating psychological consequences including feelings of <a href="/wiki/Shame" title="Shame">shame</a>, <a href="/wiki/Grief" title="Grief">loss</a> or inadequacy.<sup id="cite_ref-27" class="reference"><a href="#cite_note-27"><span class="cite-bracket">[</span>27<span class="cite-bracket">]</span></a></sup> There is a strong <a href="/wiki/Conspiracy_of_silence_(expression)" title="Conspiracy of silence (expression)">culture of silence</a> and inability to discuss the matter. Around one in ten men experience recurring impotence problems at some point in their lives.<sup id="cite_ref-28" class="reference"><a href="#cite_note-28"><span class="cite-bracket">[</span>28<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Priapism">Priapism</h3></div> <p><a href="/wiki/Priapism" title="Priapism">Priapism</a> is a painful condition in which the penis does not return to its flaccid state, despite the absence of both physical and psychological stimulation. Priapism lasting over four hours is a medical emergency. </p> <div class="mw-heading mw-heading3"><h3 id="Hard_flaccid_syndrome">Hard flaccid syndrome</h3></div> <p><a href="/wiki/Hard_flaccid_syndrome" title="Hard flaccid syndrome">Hard flaccid syndrome</a> is a rare, chronic condition characterized by a flaccid penis that remains in a firm, semi-rigid or semi-erect state in the absence of sexual arousal. </p> <div class="mw-heading mw-heading2"><h2 id="Other_animals">Other animals</h2></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Me%C4%91imurski_konj_(vranac)_na_sajmu_MESAP_2015.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/3/36/Me%C4%91imurski_konj_%28vranac%29_na_sajmu_MESAP_2015.jpg/220px-Me%C4%91imurski_konj_%28vranac%29_na_sajmu_MESAP_2015.jpg" decoding="async" width="220" height="165" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/36/Me%C4%91imurski_konj_%28vranac%29_na_sajmu_MESAP_2015.jpg/330px-Me%C4%91imurski_konj_%28vranac%29_na_sajmu_MESAP_2015.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/36/Me%C4%91imurski_konj_%28vranac%29_na_sajmu_MESAP_2015.jpg/440px-Me%C4%91imurski_konj_%28vranac%29_na_sajmu_MESAP_2015.jpg 2x" data-file-width="5152" data-file-height="3864" /></a><figcaption>A <a href="/wiki/Stallion" title="Stallion">stallion</a> with an erect penis</figcaption></figure><style data-mw-deduplicate="TemplateStyles:r1251242444">.mw-parser-output .ambox{border:1px solid #a2a9b1;border-left:10px solid #36c;background-color:#fbfbfb;box-sizing:border-box}.mw-parser-output .ambox+link+.ambox,.mw-parser-output .ambox+link+style+.ambox,.mw-parser-output .ambox+link+link+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+style+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+link+.ambox{margin-top:-1px}html body.mediawiki .mw-parser-output .ambox.mbox-small-left{margin:4px 1em 4px 0;overflow:hidden;width:238px;border-collapse:collapse;font-size:88%;line-height:1.25em}.mw-parser-output .ambox-speedy{border-left:10px solid #b32424;background-color:#fee7e6}.mw-parser-output .ambox-delete{border-left:10px solid #b32424}.mw-parser-output .ambox-content{border-left:10px solid #f28500}.mw-parser-output .ambox-style{border-left:10px solid #fc3}.mw-parser-output .ambox-move{border-left:10px solid #9932cc}.mw-parser-output .ambox-protection{border-left:10px solid #a2a9b1}.mw-parser-output .ambox .mbox-text{border:none;padding:0.25em 0.5em;width:100%}.mw-parser-output .ambox .mbox-image{border:none;padding:2px 0 2px 0.5em;text-align:center}.mw-parser-output .ambox .mbox-imageright{border:none;padding:2px 0.5em 2px 0;text-align:center}.mw-parser-output .ambox .mbox-empty-cell{border:none;padding:0;width:1px}.mw-parser-output .ambox .mbox-image-div{width:52px}@media(min-width:720px){.mw-parser-output .ambox{margin:0 10%}}@media print{body.ns-0 .mw-parser-output .ambox{display:none!important}}</style><table class="box-Trivia plainlinks metadata ambox ambox-style" role="presentation"><tbody><tr><td class="mbox-image"><div class="mbox-image-div"><span typeof="mw:File"><span><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/f/f2/Edit-clear.svg/40px-Edit-clear.svg.png" decoding="async" width="40" height="40" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/f/f2/Edit-clear.svg/60px-Edit-clear.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/f/f2/Edit-clear.svg/80px-Edit-clear.svg.png 2x" data-file-width="48" data-file-height="48" /></span></span></div></td><td class="mbox-text"><div class="mbox-text-span">This section contains a <b><a href="/wiki/Wikipedia:Manual_of_Style/Trivia_sections" title="Wikipedia:Manual of Style/Trivia sections">list of miscellaneous information</a>.</b><span class="hide-when-compact"> Please <a href="/wiki/Wikipedia:Handling_trivia#Recommendations_for_handling_trivia" title="Wikipedia:Handling trivia">relocate</a> any relevant information into other sections or articles.</span> <span class="date-container"><i>(<span class="date">May 2024</span>)</i></span></div></td></tr></tbody></table> <p>At the time of penetration, the <a href="/wiki/Canine_penis" class="mw-redirect" title="Canine penis">canine penis</a> is not erect, and only able to penetrate the female because it includes a narrow bone called the <a href="/wiki/Baculum" title="Baculum">baculum</a>, a feature of most <a href="/wiki/Placental_mammals" class="mw-redirect" title="Placental mammals">placental mammals</a>. After the male achieves penetration, he will often hold the female tighter and thrust faster, and it is during this time that the male's penis expands, unlike human sexual intercourse, where the male penis commonly becomes erect before entering the female.<sup id="cite_ref-29" class="reference"><a href="#cite_note-29"><span class="cite-bracket">[</span>29<span class="cite-bracket">]</span></a></sup> </p><p>An elephant's penis is S-shaped when fully erect and has a Y-shaped <a href="/wiki/External_urethral_orifice_(male)" class="mw-redirect" title="External urethral orifice (male)">orifice</a>.<sup id="cite_ref-30" class="reference"><a href="#cite_note-30"><span class="cite-bracket">[</span>30<span class="cite-bracket">]</span></a></sup> </p><p>Given the small amount of erectile tissue in a <a href="/wiki/Bull%27s_penis" class="mw-redirect" title="Bull's penis">bull's penis</a>, there is little enlargement after erection. The penis is quite rigid when non-erect, and becomes even more rigid during erection. Protrusion is not affected much by erection, but more by relaxation of the <a href="/wiki/Retractor_penis_muscle" class="mw-redirect" title="Retractor penis muscle">retractor penis muscle</a> and straightening of the sigmoid flexure.<sup id="cite_ref-Reece2009_31-0" class="reference"><a href="#cite_note-Reece2009-31"><span class="cite-bracket">[</span>31<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-GillespieFlanders2009_32-0" class="reference"><a href="#cite_note-GillespieFlanders2009-32"><span class="cite-bracket">[</span>32<span class="cite-bracket">]</span></a></sup> </p><p>A male <a href="/wiki/Fossa_(animal)" title="Fossa (animal)">fossa</a>'s penis reaches to between his forelegs when erect.<sup id="cite_ref-1986Köhncke_33-0" class="reference"><a href="#cite_note-1986Köhncke-33"><span class="cite-bracket">[</span>33<span class="cite-bracket">]</span></a></sup> </p><p>When not erect, a <a href="/wiki/Horse%27s_penis" class="mw-redirect" title="Horse's penis">horse's penis</a> is housed within the prepuce, 50 centimetres (20 in) long and 2.5 to 6 centimetres (0.98 to 2.36 in) in diameter with the distal end 15 to 20 centimetres (5.9 to 7.9 in). The <a href="/wiki/Retractor_penis_muscle" class="mw-redirect" title="Retractor penis muscle">retractor muscle</a> contracts to retract the penis into the sheath and relaxes to allow the penis to extend from the sheath.<sup id="cite_ref-breedingsoundness_34-0" class="reference"><a href="#cite_note-breedingsoundness-34"><span class="cite-bracket">[</span>34<span class="cite-bracket">]</span></a></sup> When erect, the penis doubles in length<sup id="cite_ref-Evans1990_35-0" class="reference"><a href="#cite_note-Evans1990-35"><span class="cite-bracket">[</span>35<span class="cite-bracket">]</span></a></sup> and thickness and the <a href="/wiki/Glans_penis" title="Glans penis">glans</a> increases by 3 to <span class="nowrap">4 times</span>.<sup id="cite_ref-breedingsoundness_34-1" class="reference"><a href="#cite_note-breedingsoundness-34"><span class="cite-bracket">[</span>34<span class="cite-bracket">]</span></a></sup> Erection and protrusion take place gradually, by the increasing <a href="/wiki/Tumescence" title="Tumescence">tumescence</a> of the erectile vascular tissue in the <i><a href="/wiki/Corpus_cavernosum_penis" title="Corpus cavernosum penis">corpus cavernosum penis</a></i>.<sup id="cite_ref-Sarkar_36-0" class="reference"><a href="#cite_note-Sarkar-36"><span class="cite-bracket">[</span>36<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Ph.D.Ph.D.2007_37-0" class="reference"><a href="#cite_note-Ph.D.Ph.D.2007-37"><span class="cite-bracket">[</span>37<span class="cite-bracket">]</span></a></sup> Most stallions achieve erection within 2 minutes of contact with an estrus mare, and mount the estrus mare 5–10 seconds afterward.<sup id="cite_ref-Samper2009_38-0" class="reference"><a href="#cite_note-Samper2009-38"><span class="cite-bracket">[</span>38<span class="cite-bracket">]</span></a></sup> </p><p>A <a href="/wiki/Bird_penis" class="mw-redirect" title="Bird penis">bird penis</a> is different in structure from <a href="/wiki/Mammal_penis" class="mw-redirect" title="Mammal penis">mammal penises</a>, being an erectile expansion of the cloacal wall and being erected by <a href="/wiki/Lymph" title="Lymph">lymph</a>, not blood.<sup id="cite_ref-Gill2006_39-0" class="reference"><a href="#cite_note-Gill2006-39"><span class="cite-bracket">[</span>39<span class="cite-bracket">]</span></a></sup> The penis of the <a href="/wiki/Lake_duck" title="Lake duck">lake duck</a> can reach about the same length as the animal himself when fully erect, but more commonly is about half the bird's length.<sup id="cite_ref-40" class="reference"><a href="#cite_note-40"><span class="cite-bracket">[</span>40<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-41" class="reference"><a href="#cite_note-41"><span class="cite-bracket">[</span>41<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Terminology">Terminology</h2></div> <style data-mw-deduplicate="TemplateStyles:r1235681985">.mw-parser-output .side-box{margin:4px 0;box-sizing:border-box;border:1px solid #aaa;font-size:88%;line-height:1.25em;background-color:var(--background-color-interactive-subtle,#f8f9fa);display:flow-root}.mw-parser-output .side-box-abovebelow,.mw-parser-output .side-box-text{padding:0.25em 0.9em}.mw-parser-output .side-box-image{padding:2px 0 2px 0.9em;text-align:center}.mw-parser-output .side-box-imageright{padding:2px 0.9em 2px 0;text-align:center}@media(min-width:500px){.mw-parser-output .side-box-flex{display:flex;align-items:center}.mw-parser-output .side-box-text{flex:1;min-width:0}}@media(min-width:720px){.mw-parser-output .side-box{width:238px}.mw-parser-output .side-box-right{clear:right;float:right;margin-left:1em}.mw-parser-output .side-box-left{margin-right:1em}}</style><style data-mw-deduplicate="TemplateStyles:r1237033735">@media print{body.ns-0 .mw-parser-output .sistersitebox{display:none!important}}@media screen{html.skin-theme-clientpref-night .mw-parser-output .sistersitebox img[src*="Wiktionary-logo-en-v2.svg"]{background-color:white}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .sistersitebox img[src*="Wiktionary-logo-en-v2.svg"]{background-color:white}}</style><div class="side-box side-box-right plainlinks sistersitebox"><style data-mw-deduplicate="TemplateStyles:r1126788409">.mw-parser-output .plainlist ol,.mw-parser-output .plainlist ul{line-height:inherit;list-style:none;margin:0;padding:0}.mw-parser-output .plainlist ol li,.mw-parser-output .plainlist ul li{margin-bottom:0}</style> <div class="side-box-flex"> <div class="side-box-image"><span class="noviewer" typeof="mw:File"><a href="/wiki/File:Wiktionary-logo-en-v2.svg" class="mw-file-description"><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/9/99/Wiktionary-logo-en-v2.svg/40px-Wiktionary-logo-en-v2.svg.png" decoding="async" width="40" height="40" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/99/Wiktionary-logo-en-v2.svg/60px-Wiktionary-logo-en-v2.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/99/Wiktionary-logo-en-v2.svg/80px-Wiktionary-logo-en-v2.svg.png 2x" data-file-width="512" data-file-height="512" /></a></span></div> <div class="side-box-text plainlist">Look up <i><b><a href="https://en.wiktionary.org/wiki/penis" class="extiw" title="wiktionary:penis">penis</a></b></i> in Wiktionary, the free dictionary.</div></div> </div> <p>Clinically, erection is often known as "penile erection", and the state of being erect, and process of erection, are described as "tumescence" or "penile tumescence". The term for the subsiding or cessation of an erection is "<a href="https://en.wiktionary.org/wiki/detumescence" class="extiw" title="wikt:detumescence">detumescence</a>". </p><p><a href="/wiki/Colloquialism" title="Colloquialism">Colloquially</a> and in <a href="/wiki/Slang" title="Slang">slang</a>, erection is known by many informal terms. Commonly encountered <a href="/wiki/English_language" title="English language">English</a> terms include 'stiffy', 'hard-on', 'boner' and 'woody'.<sup id="cite_ref-Morrissey2005_42-0" class="reference"><a href="#cite_note-Morrissey2005-42"><span class="cite-bracket">[</span>42<span class="cite-bracket">]</span></a></sup> There are several slang words, euphemisms and synonyms for an erection in English and in other languages (see also: <a href="https://en.wiktionary.org/wiki/Thesaurus:erect_penis" class="extiw" title="wiktionary:Thesaurus:erect penis">The WikiSaurus entry</a>). </p> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2></div> <style data-mw-deduplicate="TemplateStyles:r1266661725">.mw-parser-output .portalbox{padding:0;margin:0.5em 0;display:table;box-sizing:border-box;max-width:175px;list-style:none}.mw-parser-output .portalborder{border:1px solid var(--border-color-base,#a2a9b1);padding:0.1em;background:var(--background-color-neutral-subtle,#f8f9fa)}.mw-parser-output .portalbox-entry{display:table-row;font-size:85%;line-height:110%;height:1.9em;font-style:italic;font-weight:bold}.mw-parser-output .portalbox-image{display:table-cell;padding:0.2em;vertical-align:middle;text-align:center}.mw-parser-output .portalbox-link{display:table-cell;padding:0.2em 0.2em 0.2em 0.3em;vertical-align:middle}@media(min-width:720px){.mw-parser-output .portalleft{margin:0.5em 1em 0.5em 0}.mw-parser-output .portalright{clear:right;float:right;margin:0.5em 0 0.5em 1em}}</style><ul role="navigation" aria-label="Portals" class="noprint portalbox portalborder portalright"> <li class="portalbox-entry"><span class="portalbox-image"><span class="noviewer" typeof="mw:File"><a href="/wiki/File:Bisexuality_symbol_(bold,_color).svg" class="mw-file-description"><img alt="icon" src="//upload.wikimedia.org/wikipedia/commons/thumb/2/26/Bisexuality_symbol_%28bold%2C_color%29.svg/32px-Bisexuality_symbol_%28bold%2C_color%29.svg.png" decoding="async" width="32" height="20" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/2/26/Bisexuality_symbol_%28bold%2C_color%29.svg/48px-Bisexuality_symbol_%28bold%2C_color%29.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/2/26/Bisexuality_symbol_%28bold%2C_color%29.svg/64px-Bisexuality_symbol_%28bold%2C_color%29.svg.png 2x" data-file-width="25" data-file-height="16" /></a></span></span><span class="portalbox-link"><a href="/wiki/Portal:Human_sexuality" title="Portal:Human sexuality">Human sexuality portal</a></span></li></ul> <ul><li><a href="/wiki/Clitoral_erection" title="Clitoral erection">Clitoral erection</a></li> <li><a href="/wiki/Cock_ring" title="Cock ring">Cock ring</a></li> <li><a href="/wiki/Death_erection" title="Death erection">Death erection</a></li> <li><a href="/wiki/Human_penis" title="Human penis">Human penis</a></li> <li><a href="/wiki/Issues_in_social_nudity" class="mw-redirect" title="Issues in social nudity">Issues in social nudity</a></li> <li><a href="/wiki/Nipple_stimulation" title="Nipple stimulation">Nipple stimulation</a></li> <li><a href="/wiki/Priapism" title="Priapism">Priapism</a></li> <li><a href="/wiki/Sexual_function" title="Sexual function">Sexual function</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="References">References</h2></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist reflist-columns references-column-width" style="column-width: 30em;"> <ol class="references"> <li id="cite_note-Madaras2007-1"><span class="mw-cite-backlink">^ <a href="#cite_ref-Madaras2007_1-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-Madaras2007_1-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite id="CITEREFLynda_Madaras2007" class="citation book cs1">Lynda Madaras (8 June 2007). <a rel="nofollow" class="external text" href="https://books.google.com/books?id=R0eixKqC0SgC&pg=PA119"><i>What's Happening to My Body? Book for Boys: Revised Edition</i></a>. Newmarket Press. p. 119. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-1-55704-769-4" title="Special:BookSources/978-1-55704-769-4"><bdi>978-1-55704-769-4</bdi></a><span class="reference-accessdate">. Retrieved <span class="nowrap">22 July</span> 2013</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=What%27s+Happening+to+My+Body%3F+Book+for+Boys%3A+Revised+Edition&rft.pages=119&rft.pub=Newmarket+Press&rft.date=2007-06-08&rft.isbn=978-1-55704-769-4&rft.au=Lynda+Madaras&rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3DR0eixKqC0SgC%26pg%3DPA119&rfr_id=info%3Asid%2Fen.wikipedia.org%3AErection" class="Z3988"></span></span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFGoldblatt1990" class="citation book cs1">Goldblatt, Howard (1990). <i>Worlds Apart: Recent Chinese Writing and Its Audiences</i>. p. 56.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Worlds+Apart%3A+Recent+Chinese+Writing+and+Its+Audiences&rft.pages=56&rft.date=1990&rft.aulast=Goldblatt&rft.aufirst=Howard&rfr_id=info%3Asid%2Fen.wikipedia.org%3AErection" class="Z3988"></span></span> </li> <li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.wiley.com/legacy/college/boyer/0470003790/cutting_edge/viagra/viagra.gif">wiley.com > Viagra function image</a> Retrieved on Mars 11, 2010</span> </li> <li id="cite_note-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-4">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.vascularweb.org/APDVS/BasicScienceCurriculum/Pages/AnatomyandPhysiologyofNormalErection.aspx">APDVS > 31. Anatomy and Physiology of Normal Erection</a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20100714053839/http://www.vascularweb.org/APDVS/BasicScienceCurriculum/Pages/AnatomyandPhysiologyofNormalErection.aspx">Archived</a> 2010-07-14 at the <a href="/wiki/Wayback_Machine" title="Wayback Machine">Wayback Machine</a> Retrieved on Mars 11, 2010</span> </li> <li id="cite_note-Marieb-5"><span class="mw-cite-backlink">^ <a href="#cite_ref-Marieb_5-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-Marieb_5-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFMarieb2013" class="citation book cs1">Marieb, Elaine (2013). <i>Anatomy & physiology</i>. Benjamin-Cummings. p. 895. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/9780321887603" title="Special:BookSources/9780321887603"><bdi>9780321887603</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Anatomy+%26+physiology&rft.pages=895&rft.pub=Benjamin-Cummings&rft.date=2013&rft.isbn=9780321887603&rft.aulast=Marieb&rft.aufirst=Elaine&rfr_id=info%3Asid%2Fen.wikipedia.org%3AErection" class="Z3988"></span></span> </li> <li id="cite_note-6"><span class="mw-cite-backlink"><b><a href="#cite_ref-6">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFMooreAnne_Agur2007" class="citation book cs1">Moore, Keith; Anne Agur (2007). <i>Essential Clinical Anatomy, Third Edition</i>. Lippincott Williams & Wilkins. p. 265. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-7817-6274-8" title="Special:BookSources/978-0-7817-6274-8"><bdi>978-0-7817-6274-8</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Essential+Clinical+Anatomy%2C+Third+Edition&rft.pages=265&rft.pub=Lippincott+Williams+%26+Wilkins&rft.date=2007&rft.isbn=978-0-7817-6274-8&rft.aulast=Moore&rft.aufirst=Keith&rft.au=Anne+Agur&rfr_id=info%3Asid%2Fen.wikipedia.org%3AErection" class="Z3988"></span></span> </li> <li id="cite_note-7"><span class="mw-cite-backlink"><b><a href="#cite_ref-7">^</a></b></span> <span class="reference-text">Drake, Richard, Wayne Vogl and Adam Mitchell, Grey's Anatomy for Students. Philadelphia, 2004. (<link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/0-443-06612-4" title="Special:BookSources/0-443-06612-4">0-443-06612-4</a>)</span> </li> <li id="cite_note-Penis_Structure,_Encyclopedia_of_Reproduction-8"><span class="mw-cite-backlink"><b><a href="#cite_ref-Penis_Structure,_Encyclopedia_of_Reproduction_8-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFHsuLiu2018" class="citation book cs1">Hsu, Geng-Long; Liu, Shih-Ping (2018). "Penis Structure". <i>Encyclopedia of Reproduction</i>. Academic Press. pp. <span class="nowrap">357–</span>366. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1016%2FB978-0-12-801238-3.64602-0">10.1016/B978-0-12-801238-3.64602-0</a>. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/9780128151457" title="Special:BookSources/9780128151457"><bdi>9780128151457</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=bookitem&rft.atitle=Penis+Structure&rft.btitle=Encyclopedia+of+Reproduction&rft.pages=%3Cspan+class%3D%22nowrap%22%3E357-%3C%2Fspan%3E366&rft.pub=Academic+Press&rft.date=2018&rft_id=info%3Adoi%2F10.1016%2FB978-0-12-801238-3.64602-0&rft.isbn=9780128151457&rft.aulast=Hsu&rft.aufirst=Geng-Long&rft.au=Liu%2C+Shih-Ping&rfr_id=info%3Asid%2Fen.wikipedia.org%3AErection" class="Z3988"></span></span> </li> <li id="cite_note-Penis_Structure-Erection,_Encyclopedia_of_Reproduction-9"><span class="mw-cite-backlink"><b><a href="#cite_ref-Penis_Structure-Erection,_Encyclopedia_of_Reproduction_9-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFHsuLu2018" class="citation book cs1">Hsu, Geng-Long; Lu, Hsiu-Chen (2018). <i>Penis Structure-Erection</i>. 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Macmillan. pp. 414–. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-7167-4983-7" title="Special:BookSources/978-0-7167-4983-7"><bdi>978-0-7167-4983-7</bdi></a><span class="reference-accessdate">. Retrieved <span class="nowrap">5 December</span> 2012</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Ornithology&rft.pages=414-&rft.pub=Macmillan&rft.date=2006-10-06&rft.isbn=978-0-7167-4983-7&rft.au=Frank+B.+Gill&rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3DzM0tG5ApO0UC%26q%3Dpenis%26pg%3DPA414&rfr_id=info%3Asid%2Fen.wikipedia.org%3AErection" class="Z3988"></span></span> </li> <li id="cite_note-40"><span class="mw-cite-backlink"><b><a href="#cite_ref-40">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFMcCracken2000" class="citation journal cs1">McCracken, Kevin G. (2000). <a rel="nofollow" class="external text" href="http://www.bio.miami.edu/mccracken/reprints/auk-117-820.pdf">"The 20-cm Spiny Penis of the Argentine Lake Duck (<i>Oxyura vittata</i>)"</a> <span class="cs1-format">(PDF)</span>. <i><a href="/wiki/The_Auk" class="mw-redirect" title="The Auk">The Auk</a></i>. <b>117</b> (3): <span class="nowrap">820–</span>825. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.2307%2F4089612">10.2307/4089612</a>. <a href="/wiki/JSTOR_(identifier)" class="mw-redirect" title="JSTOR (identifier)">JSTOR</a> <a rel="nofollow" class="external text" href="https://www.jstor.org/stable/4089612">4089612</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=The+Auk&rft.atitle=The+20-cm+Spiny+Penis+of+the+Argentine+Lake+Duck+%28Oxyura+vittata%29&rft.volume=117&rft.issue=3&rft.pages=%3Cspan+class%3D%22nowrap%22%3E820-%3C%2Fspan%3E825&rft.date=2000&rft_id=info%3Adoi%2F10.2307%2F4089612&rft_id=https%3A%2F%2Fwww.jstor.org%2Fstable%2F4089612%23id-name%3DJSTOR&rft.aulast=McCracken&rft.aufirst=Kevin+G.&rft_id=http%3A%2F%2Fwww.bio.miami.edu%2Fmccracken%2Freprints%2Fauk-117-820.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3AErection" class="Z3988"></span></span> </li> <li id="cite_note-41"><span class="mw-cite-backlink"><b><a href="#cite_ref-41">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFMcCrackenWilsonMcCrackenJohnson2001" class="citation journal cs1">McCracken, Kevin G.; Wilson, Robert E.; McCracken, Pamela J.; Johnson, Kevin P. (2001). <a rel="nofollow" class="external text" href="http://www.bio.miami.edu/mccracken/reprints/nature-413-128.pdf">"Sexual selection: Are ducks impressed by drakes' display?"</a> <span class="cs1-format">(PDF)</span>. <i><a href="/wiki/Nature_(journal)" title="Nature (journal)">Nature</a></i>. <b>413</b> (6852): 128. <a href="/wiki/Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/2001Natur.413..128M">2001Natur.413..128M</a>. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://doi.org/10.1038%2F35093160">10.1038/35093160</a></span>. <a href="/wiki/PMID_(identifier)" class="mw-redirect" title="PMID (identifier)">PMID</a> <a rel="nofollow" class="external text" href="https://pubmed.ncbi.nlm.nih.gov/11557968">11557968</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Nature&rft.atitle=Sexual+selection%3A+Are+ducks+impressed+by+drakes%27+display%3F&rft.volume=413&rft.issue=6852&rft.pages=128&rft.date=2001&rft_id=info%3Apmid%2F11557968&rft_id=info%3Adoi%2F10.1038%2F35093160&rft_id=info%3Abibcode%2F2001Natur.413..128M&rft.aulast=McCracken&rft.aufirst=Kevin+G.&rft.au=Wilson%2C+Robert+E.&rft.au=McCracken%2C+Pamela+J.&rft.au=Johnson%2C+Kevin+P.&rft_id=http%3A%2F%2Fwww.bio.miami.edu%2Fmccracken%2Freprints%2Fnature-413-128.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3AErection" class="Z3988"></span></span> </li> <li id="cite_note-Morrissey2005-42"><span class="mw-cite-backlink"><b><a href="#cite_ref-Morrissey2005_42-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFGabrielle_Morrissey2005" class="citation book cs1">Gabrielle Morrissey (27 January 2005). <a rel="nofollow" class="external text" href="https://books.google.com/books?id=PRx_227VB7cC&pg=PT6"><i>Urge: Hot Secrets For Great Sex</i></a>. HarperCollins Publishers. p. 6. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-7304-4527-2" title="Special:BookSources/978-0-7304-4527-2"><bdi>978-0-7304-4527-2</bdi></a><span class="reference-accessdate">. Retrieved <span class="nowrap">22 July</span> 2013</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Urge%3A+Hot+Secrets+For+Great+Sex&rft.pages=6&rft.pub=HarperCollins+Publishers&rft.date=2005-01-27&rft.isbn=978-0-7304-4527-2&rft.au=Gabrielle+Morrissey&rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3DPRx_227VB7cC%26pg%3DPT6&rfr_id=info%3Asid%2Fen.wikipedia.org%3AErection" class="Z3988"></span></span> </li> </ol></div> <div class="navbox-styles"><style data-mw-deduplicate="TemplateStyles:r1129693374">.mw-parser-output .hlist dl,.mw-parser-output .hlist ol,.mw-parser-output .hlist ul{margin:0;padding:0}.mw-parser-output .hlist dd,.mw-parser-output .hlist dt,.mw-parser-output .hlist li{margin:0;display:inline}.mw-parser-output .hlist.inline,.mw-parser-output .hlist.inline dl,.mw-parser-output .hlist.inline ol,.mw-parser-output .hlist.inline ul,.mw-parser-output .hlist dl dl,.mw-parser-output .hlist dl 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title="Insemination">Insemination</a></li> <li><a href="/wiki/Intersex" title="Intersex">Intersex</a></li> <li><a href="/wiki/Libido" title="Libido">Libido</a></li> <li><a href="/wiki/Nocturnal_emission" title="Nocturnal emission">Nocturnal emission</a></li> <li><a href="/wiki/Orgasm" title="Orgasm">Orgasm</a> <ul><li><a href="/wiki/Female_ejaculation" title="Female ejaculation">Female</a> and <a href="/wiki/Ejaculation" title="Ejaculation">male ejaculation</a></li></ul></li> <li><a href="/wiki/Pelvic_thrust" title="Pelvic thrust">Pelvic thrust</a></li> <li><a class="mw-selflink selflink">Penile erection</a></li> <li><a href="/wiki/Pre-ejaculate" title="Pre-ejaculate">Pre-ejaculate</a></li> <li><a href="/wiki/Pregnancy" title="Pregnancy">Pregnancy</a></li> <li><a href="/wiki/Sexual_arousal" title="Sexual arousal">Sexual arousal</a></li> <li><a href="/wiki/Human_sexual_response_cycle" title="Human sexual response cycle">Sexual response cycle</a></li> <li><a href="/wiki/Sexual_stimulation" title="Sexual stimulation">Sexual stimulation</a></li> <li><a href="/wiki/Vaginal_lubrication" title="Vaginal lubrication">Vaginal lubrication</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Sexual_and_reproductive_health" title="Sexual and reproductive health">Health</a> and<br /><a href="/wiki/Sex_education" title="Sex education">education</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Birth_control" title="Birth control">Birth control</a></li> <li><a href="/wiki/Condom" title="Condom">Condom</a></li> <li><a href="/wiki/Male_contraceptive" title="Male contraceptive">Male contraceptive</a></li> <li><a href="/wiki/Masters_and_Johnson" title="Masters and Johnson">Masters and Johnson</a></li> <li><a href="/wiki/Obesity_and_sexuality" title="Obesity and sexuality">Obesity and sexuality</a></li> <li><a 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title="Hypoactive sexual desire disorder">Hyposexuality</a></li></ul></li> <li><a href="/wiki/Sexual_medicine" title="Sexual medicine">Sexual medicine</a></li> <li><a href="/wiki/Sexual_surrogate" class="mw-redirect" title="Sexual surrogate">Sexual surrogate</a></li> <li><a href="/wiki/Sexually_transmitted_infection" title="Sexually transmitted infection">Sexually transmitted infection</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Identity_(social_science)" title="Identity (social science)">Identity</a> and <a href="/wiki/Sexual_diversity" title="Sexual diversity">diversity</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Gender_binary" title="Gender binary">Gender binary</a></li> <li><a href="/wiki/Gender_identity" title="Gender identity">Gender identity</a></li> <li><a href="/wiki/Men_who_have_sex_with_men" title="Men who have sex with men">Men who have sex with men</a></li> <li><a href="/wiki/Sexual_identity" title="Sexual identity">Sexual identity</a></li> <li><a href="/wiki/Sexual_orientation" title="Sexual orientation">Sexual orientation</a></li> <li><a href="/wiki/Women_who_have_sex_with_women" title="Women who have sex with women">Women who have sex with women</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Sex_and_the_law" title="Sex and the law">Law</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Age_of_consent" title="Age of consent">Age of consent</a></li> <li><a href="/wiki/Criminal_transmission_of_HIV" title="Criminal transmission of HIV">Criminal transmission of HIV</a></li> <li><a href="/wiki/Child_sexual_abuse" title="Child sexual abuse">Child sexual abuse</a></li> <li><a href="/wiki/Incest" title="Incest">Incest</a></li> <li><a href="/wiki/Indecent_exposure" title="Indecent exposure">Indecent exposure</a></li> <li><a href="/wiki/Obscenity" title="Obscenity">Obscenity</a></li> <li><a href="/wiki/Sexual_abuse" title="Sexual abuse">Sexual abuse</a> <ul><li><a href="/wiki/Cybersex_trafficking" title="Cybersex trafficking">Cybersex trafficking</a></li> <li><a href="/wiki/Rape" title="Rape">Rape</a></li> <li><a href="/wiki/Sex_trafficking" title="Sex trafficking">Sex trafficking</a></li> <li><a href="/wiki/Sexual_assault" title="Sexual assault">Sexual assault</a></li> <li><a href="/wiki/Sexual_harassment" title="Sexual harassment">Sexual harassment</a></li> <li><a href="/wiki/Sexual_misconduct" title="Sexual misconduct">Sexual misconduct</a></li> <li><a href="/wiki/Sexual_slavery" title="Sexual slavery">Sexual slavery</a></li> <li><a href="/wiki/Sexual_violence" title="Sexual violence">Sexual violence</a></li> <li><a href="/wiki/Revenge_pornography" class="mw-redirect" title="Revenge pornography">Revenge pornography</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/History_of_human_sexuality" title="History of human sexuality">History</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Blue_Movie" title="Blue Movie">Blue Movie</a></li> <li><a href="/wiki/Counterculture_of_the_1960s" title="Counterculture of the 1960s">Counterculture of the 1960s</a></li> <li><a href="/wiki/Feminist_sex_wars" title="Feminist sex wars">Feminist sex wars</a></li> <li><a href="/wiki/Golden_Age_of_Porn" title="Golden Age of Porn">Golden Age of Porn</a></li> <li><a href="/wiki/History_of_erotic_depictions" title="History of erotic depictions">History of erotic depictions</a></li> <li><a href="/wiki/Sexual_revolution" title="Sexual revolution">Sexual revolution</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Intimate_relationship" title="Intimate relationship">Relationships</a><br /> and <a href="/wiki/Society" title="Society">society</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Anarchism_and_issues_related_to_love_and_sex" title="Anarchism and issues related to love and sex">Anarchism and love/sex</a></li> <li><a href="/wiki/Extramarital_sex" title="Extramarital sex">Extramarital sex</a></li> <li><a href="/wiki/Family_planning" title="Family planning">Family planning</a></li> <li><a href="/wiki/Flirting" title="Flirting">Flirting</a></li> <li><a href="/wiki/Free_love" title="Free love">Free love</a></li> <li><a href="/wiki/Marriage" title="Marriage">Marriage</a></li> <li><a href="/wiki/Modesty" title="Modesty">Modesty</a></li> <li><a href="/wiki/Orgasm_gap" title="Orgasm gap">Orgasm gap</a></li> <li><a href="/wiki/Polyamory" title="Polyamory">Polyamory</a></li> <li><a href="/wiki/Premarital_sex" title="Premarital sex">Premarital sex</a></li> <li><a href="/wiki/Promiscuity" title="Promiscuity">Promiscuity</a></li> <li><a href="/wiki/Romance_(love)" title="Romance (love)">Romance</a></li> <li><a href="/wiki/Sex-positive_movement" title="Sex-positive movement">Sex-positive movement</a></li> <li><a href="/wiki/Sexual_abstinence" title="Sexual abstinence">Sexual abstinence</a></li> <li><a href="/wiki/Sexual_addiction" title="Sexual addiction">Sexual addiction</a></li> <li><a href="/wiki/Sexual_attraction" title="Sexual attraction">Sexual attraction</a></li> <li><a href="/wiki/Sexual_capital" title="Sexual capital">Sexual capital</a></li> <li><a href="/wiki/Sexual_ethics" title="Sexual ethics">Sexual ethics</a></li> <li><a href="/wiki/Sexual_objectification" title="Sexual objectification">Sexual objectification</a></li> <li><a href="/wiki/Sexual_repression" title="Sexual repression">Sexual repression</a></li> <li><a href="/wiki/Sexual_slang" title="Sexual slang">Sexual slang</a></li> <li><a href="/wiki/Split_attraction_model" title="Split attraction model">Split attraction model</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Category:Sexuality_by_country" title="Category:Sexuality by country">By country</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Sexuality_in_ancient_Rome" title="Sexuality in ancient Rome">Ancient Rome</a></li> <li><a href="/wiki/Sexuality_in_China" title="Sexuality in China">China</a></li> <li><a href="/wiki/Sexuality_in_India" title="Sexuality in India">India</a></li> <li><a href="/wiki/Sexuality_in_Japan" title="Sexuality in Japan">Japan</a></li> <li><a href="/wiki/Sexuality_in_the_Philippines" title="Sexuality in the Philippines">Philippines</a></li> <li><a href="/wiki/Sexuality_in_South_Korea" title="Sexuality in South Korea">South Korea</a></li> <li><a href="/wiki/Sexuality_in_the_United_States" title="Sexuality in the United States">United States</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Human_sexual_activity" title="Human sexual activity">Sexual activities</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Conventional_sex" title="Conventional sex">Conventional sex</a></li> <li><a href="/wiki/Anal_sex" title="Anal sex">Anal sex</a></li> <li><a href="/wiki/Bareback_(sexual_act)" title="Bareback (sexual act)">Bareback</a></li> <li><a href="/wiki/BDSM" title="BDSM">BDSM</a></li> <li><a href="/wiki/Child_sexuality" title="Child sexuality">Child sex</a></li> <li><a href="/wiki/Creampie_(sexual_act)" title="Creampie (sexual act)">Creampie</a></li> <li><a href="/wiki/Edging_(sexual_practice)" title="Edging (sexual practice)">Edging</a></li> <li><a href="/wiki/Erotic_sexual_denial" title="Erotic sexual denial">Erotic sexual denial</a></li> <li><a href="/wiki/Facial_(sexual_act)" title="Facial (sexual act)">Facial</a></li> <li><a href="/wiki/Sexual_fetishism" title="Sexual fetishism">Fetishism</a></li> <li><a href="/wiki/Fisting" title="Fisting">Fisting</a></li> <li><a href="/wiki/Foot_fetishism" title="Foot fetishism">Foot fetishism</a></li> <li><a href="/wiki/Footjob" title="Footjob">Footjob</a></li> <li><a href="/wiki/Forced_orgasm" title="Forced orgasm">Forced orgasm</a></li> <li><a href="/wiki/Frot" title="Frot">Frot</a></li> <li><a href="/wiki/Gang_bang" title="Gang bang">Gang bang</a></li> <li><a href="/wiki/Group_sex" title="Group sex">Group sex</a></li> <li><a href="/wiki/Mammary_intercourse" title="Mammary intercourse">Mammary intercourse</a></li> <li><a href="/wiki/Non-penetrative_sex#Manual_sex" title="Non-penetrative sex">Manual sex</a> <ul><li><a href="/wiki/Fingering_(sexual_act)#Anus" title="Fingering (sexual act)">Anal fingering</a></li> <li><a href="/wiki/Fingering_(sexual_act)" title="Fingering (sexual act)">Fingering</a></li> <li><a href="/wiki/Handjob" title="Handjob">Handjob</a></li></ul></li> <li><a href="/wiki/Masturbation" title="Masturbation">Masturbation</a></li> <li><a href="/wiki/Mechanics_of_human_sexuality" title="Mechanics of human sexuality">Mechanics of sex</a></li> <li><a href="/wiki/Nipple_stimulation" title="Nipple stimulation">Nipple stimulation</a></li> <li><a href="/wiki/Non-penetrative_sex" title="Non-penetrative sex">Non-penetrative sex</a></li> <li><a href="/wiki/Oral_sex" title="Oral sex">Oral sex</a> <ul><li><a href="/wiki/69_(sex_position)" title="69 (sex position)">69</a></li> <li><a href="/wiki/Anilingus" title="Anilingus">Anilingus</a></li> <li><a href="/wiki/Cunnilingus" title="Cunnilingus">Cunnilingus</a></li> <li><a href="/wiki/Fellatio" title="Fellatio">Fellatio</a></li> <li><a href="/wiki/Irrumatio" title="Irrumatio">Irrumatio</a></li></ul></li> <li><a href="/wiki/Paraphilia" title="Paraphilia">Paraphilia</a></li> <li><a href="/wiki/Pompoir" title="Pompoir">Pompoir</a></li> <li><a href="/wiki/Quickie_(sex)" class="mw-redirect" title="Quickie (sex)">Quickie</a></li> <li><a href="/wiki/Sexercise" title="Sexercise">Sexercise</a></li> <li><a href="/wiki/Sex_in_space" title="Sex in space">Sex in space</a></li> <li><a href="/wiki/Sex_position" title="Sex position">Sex positions</a></li> <li><a href="/wiki/Sexual_fantasy" title="Sexual fantasy">Sexual fantasy</a></li> <li><a href="/wiki/Sexual_fetishism" title="Sexual fetishism">Sexual fetishism</a></li> <li><a href="/wiki/Sexual_intercourse" title="Sexual intercourse">Sexual intercourse</a> <ul><li><a href="/wiki/Foreplay" title="Foreplay">Foreplay</a></li></ul></li> <li><a href="/wiki/Sexual_penetration" title="Sexual penetration">Sexual penetration</a></li> <li><a href="/wiki/Sumata" class="mw-redirect" title="Sumata">Sumata</a></li> <li><a href="/wiki/Swinging_(sexual_practice)" title="Swinging (sexual practice)">Swinging</a></li> <li><a href="/wiki/Tribadism" title="Tribadism">Tribadism</a></li> <li><a href="/wiki/Urethral_intercourse" title="Urethral intercourse">Urethral intercourse</a></li> <li><a href="/wiki/Urolagnia" title="Urolagnia">Urolagnia</a></li> <li><a href="/wiki/Virtual_sex" title="Virtual sex">Virtual sex</a> <ul><li><a href="/wiki/Cybersex" title="Cybersex">Cybersex</a></li> <li><a href="/wiki/Erotic_talk" title="Erotic talk">Erotic talk</a></li></ul></li> <li><a href="/wiki/Wet_T-shirt_contest" title="Wet T-shirt contest">Wet T-shirt contest</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Sex_industry" title="Sex industry">Sex industry</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Sex_and_nudity_in_video_games" class="mw-redirect" title="Sex and nudity in video games">Adult video games</a></li> <li><a href="/wiki/Erotica" title="Erotica">Erotica</a></li> <li><a href="/wiki/Pornography" title="Pornography">Pornography</a> <ul><li><a href="/wiki/Pornographic_film_actor" title="Pornographic film actor">Film actor</a></li></ul></li> <li><a href="/wiki/Prostitution" title="Prostitution">Prostitution</a> <ul><li><a href="/wiki/Sacred_prostitution" title="Sacred prostitution">Sacred</a></li> <li><a href="/wiki/Survival_sex" title="Survival sex">Survival sex</a></li></ul></li> <li><a href="/wiki/Red-light_district" title="Red-light district">Red-light district</a></li> <li><a href="/wiki/List_of_sex_museums" title="List of sex museums">Sex museum</a></li> <li><a href="/wiki/Sex_shop" title="Sex shop">Sex shop</a></li> <li><a href="/wiki/Sex_tourism" title="Sex tourism">Sex tourism</a> <ul><li><a href="/wiki/Child_sex_tourism" title="Child sex tourism">Child</a></li> <li><a href="/wiki/Female_sex_tourism" title="Female sex tourism">Female</a></li></ul></li> <li><a href="/wiki/Sex_worker" title="Sex worker">Sex worker</a></li> <li><a href="/wiki/Sex_toy" title="Sex toy">Sex toy</a> <ul><li><a href="/wiki/Sex_doll" title="Sex doll">Doll</a></li></ul></li> <li><a href="/wiki/Strip_club" title="Strip club">Strip club</a></li> <li><a href="/wiki/Webcam_model" title="Webcam model">Webcam model</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Religion_and_sexuality" title="Religion and sexuality">Religion and<br />sexuality</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Buddhism_and_sexuality" title="Buddhism and sexuality">Buddhism</a> and <a href="/wiki/Hinduism_and_sexuality" class="mw-redirect" title="Hinduism and sexuality">Hinduism</a> <ul><li><a href="/wiki/Tantric_sex" title="Tantric sex">Tantric sex</a></li></ul></li> <li><a href="/wiki/Sexuality_in_Christian_demonology" title="Sexuality in Christian demonology">Christian demonology</a></li> <li><a href="/wiki/Clerical_celibacy" title="Clerical celibacy">Clerical celibacy</a> <ul><li><a href="/wiki/Buddhist_monasticism" title="Buddhist monasticism">Buddhist monasticism</a></li> <li><a href="/wiki/Clerical_celibacy_in_the_Catholic_Church" title="Clerical celibacy in the Catholic Church">Catholic Church</a></li> <li><a href="/wiki/Matha" title="Matha">Hindu monasticism</a></li> <li><a href="/wiki/Jain_monasticism" title="Jain monasticism">Jain monasticism</a></li></ul></li> <li><a href="/wiki/Taoist_sexual_practices" title="Taoist sexual practices">Daoism</a></li> <li><a href="/wiki/Islamic_sexual_jurisprudence" class="mw-redirect" title="Islamic sexual jurisprudence">Islam</a></li> <li><a href="/wiki/Judaism_and_sexuality" title="Judaism and sexuality">Judaism</a></li> <li><a href="/wiki/Religion_and_LGBT_people" class="mw-redirect" title="Religion and LGBT people">LGBT people</a> <ul><li><a href="/wiki/LGBT-affirming_religious_groups" class="mw-redirect" title="LGBT-affirming religious groups">LGBT-affirming religious groups</a></li></ul></li> <li><a href="/wiki/Sexuality_and_Mormonism" class="mw-redirect" title="Sexuality and Mormonism">Mormonism</a></li> <li><a href="/wiki/Sacred_prostitution" title="Sacred prostitution">Sacred prostitution</a> <ul><li><a href="/wiki/Sacred_prostitution_in_ancient_Greece" title="Sacred prostitution in ancient Greece">Ancient Greece</a></li></ul></li> <li><a href="/wiki/Thelema" title="Thelema">Thelema</a> <ul><li><a href="/wiki/Sex_magic" title="Sex magic">Sex magic</a></li></ul></li></ul> </div></td></tr><tr><td class="navbox-abovebelow" colspan="2"><div> <ul><li><span class="nowrap"><span class="noviewer" typeof="mw:File"><a href="/wiki/File:Bisexuality_symbol_(bold,_color).svg" class="mw-file-description"><img alt="icon" src="//upload.wikimedia.org/wikipedia/commons/thumb/2/26/Bisexuality_symbol_%28bold%2C_color%29.svg/16px-Bisexuality_symbol_%28bold%2C_color%29.svg.png" decoding="async" width="16" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/2/26/Bisexuality_symbol_%28bold%2C_color%29.svg/24px-Bisexuality_symbol_%28bold%2C_color%29.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/2/26/Bisexuality_symbol_%28bold%2C_color%29.svg/32px-Bisexuality_symbol_%28bold%2C_color%29.svg.png 2x" data-file-width="25" data-file-height="16" /></a></span> </span><a href="/wiki/Portal:Human_sexuality" title="Portal:Human sexuality">Human sexuality portal</a></li></ul> </div></td></tr></tbody></table></div> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236075235"></div><div role="navigation" class="navbox" aria-labelledby="Human_sexuality_and_sexology177" style="padding:3px"><table class="nowraplinks mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239400231"><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Human_sexuality" title="Template:Human sexuality"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Human_sexuality" title="Template talk:Human sexuality"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Human_sexuality" title="Special:EditPage/Template:Human sexuality"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Human_sexuality_and_sexology177" style="font-size:114%;margin:0 4em"><a href="/wiki/Human_sexuality" title="Human sexuality">Human sexuality</a> and <a href="/wiki/Sexology" title="Sexology">sexology</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%;text-align:center;"><div style="display: inline-block; line-height: 1.2em; padding: .1em 0;"><a href="/wiki/Sexual_relationship" class="mw-redirect" title="Sexual relationship">Sexual relationship</a><br />phenomena</div></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Aromanticism" title="Aromanticism">Aromanticism</a></li> <li><a href="/wiki/Asexuality" title="Asexuality">Asexuality</a> <ul><li><a href="/wiki/Gray_asexuality" title="Gray asexuality">Gray asexuality</a> <ul><li><a href="/wiki/Demisexuality" title="Demisexuality">Demisexuality</a></li> <li><a href="/wiki/Fictosexuality" title="Fictosexuality">Fictosexuality</a></li></ul></li></ul></li> <li><a href="/wiki/Bisexuality" title="Bisexuality">Bisexuality</a> <ul><li><a href="/wiki/Pansexuality" title="Pansexuality">Pansexuality</a></li></ul></li> <li><a href="/wiki/Casual_dating" title="Casual dating">Casual relationship</a></li> <li><a href="/wiki/Casual_sex" title="Casual sex">Casual sex</a></li> <li><a href="/wiki/Celibacy" title="Celibacy">Celibacy</a> <ul><li><a href="/wiki/Love_shyness" class="mw-redirect" title="Love shyness">Love shyness</a></li> <li><a href="/wiki/Celibacy_syndrome" title="Celibacy syndrome">Celibacy syndrome</a></li> <li><a href="/wiki/Herbivore_men" title="Herbivore men">Herbivore men</a></li></ul></li> <li><a href="/wiki/Committed_relationship" title="Committed relationship">Committed relationship</a></li> <li><a href="/wiki/Conventional_sex" title="Conventional sex">Conventional sex</a></li> <li><a href="/wiki/Flirting" title="Flirting">Flirting</a></li> <li><a href="/wiki/Free_love" title="Free love">Free love</a></li> <li><a href="/wiki/Foreplay" title="Foreplay">Foreplay</a></li> <li><a href="/wiki/Friends_with_benefits_relationships" class="mw-redirect" title="Friends with benefits relationships">Friends with benefits relationships</a></li> <li><a href="/wiki/Group_sex" title="Group sex">Group sex</a></li> <li><a href="/wiki/Heterosexuality" title="Heterosexuality">Heterosexuality</a></li> <li><a href="/wiki/Homosexuality" title="Homosexuality">Homosexuality</a></li> <li><a href="/wiki/Hypersexuality" title="Hypersexuality">Hypersexuality</a></li> <li><a href="/wiki/LGBT" class="mw-redirect" title="LGBT">LGBT</a></li> <li><a href="/wiki/Marriage" title="Marriage">Marriage</a></li> <li><a href="/wiki/One-night_stand" title="One-night stand">One-night stand</a></li> <li><a href="/wiki/Polyamory" title="Polyamory">Polyamory</a></li> <li><a href="/wiki/Promiscuity" title="Promiscuity">Promiscuity</a> <ul><li><a href="/wiki/Female_promiscuity" title="Female promiscuity">Female</a></li></ul></li> <li><a href="/wiki/Romance_(love)" title="Romance (love)">Romantic love</a> <ul><li><a href="/wiki/Romantic_orientation" title="Romantic orientation">Romantic orientation</a></li></ul></li> <li><a href="/wiki/Queer_heterosexuality" title="Queer heterosexuality">Queer heterosexuality</a></li> <li><a href="/wiki/Sex_life" title="Sex life">Sex life</a></li> <li><a href="/wiki/Sexual_abstinence" title="Sexual abstinence">Sexual abstinence</a></li> <li><a href="/wiki/Sexual_orientation" title="Sexual orientation">Sexual orientation</a></li> <li><a href="/wiki/Sexual_partner" title="Sexual partner">Sexual partner</a></li> <li><a href="/wiki/Sexual_repression" title="Sexual repression">Sexual repression</a></li> <li><a href="/wiki/Single_person" title="Single person">Single person</a></li> <li><a href="/wiki/Split_attraction_model" title="Split attraction model">Split attraction model</a></li> <li><a href="/wiki/Swinging_(sexual_practice)" title="Swinging (sexual practice)">Swinging</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%;text-align:center;">Sexual dynamics</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Hypergamy" title="Hypergamy">Hypergamy</a></li> <li><a href="/wiki/Physical_attractiveness" title="Physical attractiveness">Physical attractiveness</a></li> <li><a href="/wiki/Sexual_attraction" title="Sexual attraction">Sexual attraction</a></li> <li><a href="/wiki/Sexual_capital" title="Sexual capital">Sexual capital</a></li> <li><a href="/wiki/Sexual_ethics" title="Sexual ethics">Sexual ethics</a></li> <li><a href="/wiki/Sexual_frustration" title="Sexual frustration">Sexual frustration</a></li> <li><a href="/wiki/Sociosexuality" title="Sociosexuality">Sociosexuality</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%;text-align:center;">See also</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Abortion-rights_movement" title="Abortion-rights movement">Abortion-rights movement</a></li> <li><a href="/wiki/Adolescent_sexuality" title="Adolescent sexuality">Adolescent sexuality</a></li> <li><a href="/wiki/Age_of_consent" title="Age of consent">Age of consent</a></li> <li><a href="/wiki/Decriminalization_of_sex_work" title="Decriminalization of sex work">Decriminalization of sex work</a></li> <li><a href="/wiki/Dogging_(sexual_slang)" title="Dogging (sexual slang)">Dogging (sexual slang)</a></li> <li><a href="/wiki/Human_female_sexuality" title="Human female sexuality">Human female sexuality</a></li> <li><a href="/wiki/Human_male_sexuality" title="Human male sexuality">Human male sexuality</a></li> <li><a href="/wiki/LGBTQ_rights_by_country_or_territory" title="LGBTQ rights by country or territory">LGBTQ rights by country or territory</a></li> <li><a href="/wiki/Porn_for_women" title="Porn for women">Porn for women</a></li> <li><a href="/wiki/Public_sex" title="Public sex">Public sex</a></li> <li><a href="/wiki/Reproductive_rights" title="Reproductive rights">Reproductive rights</a></li> <li><a href="/wiki/Right_to_privacy" title="Right to privacy">Right to privacy</a></li> <li><a href="/wiki/Right_to_sexuality" title="Right to sexuality">Right to sexuality</a></li> <li><a href="/wiki/Sex_Addicts_Anonymous" title="Sex Addicts Anonymous">Sex Addicts Anonymous</a></li> <li><a href="/wiki/Sex_and_drugs" title="Sex and drugs">Sex and drugs</a></li> <li><a href="/wiki/Sex_worker_movements" title="Sex worker movements">Sex worker movements</a></li> <li><a href="/wiki/Sex_workers%27_rights" title="Sex workers' rights">Sex workers' rights</a></li> <li><a href="/wiki/Sexecology" title="Sexecology">Sexecology</a></li> <li><a href="/wiki/Sex-positive_feminism" title="Sex-positive feminism">Sex-positive feminism</a></li> <li><a href="/wiki/Sex-positive_movement" title="Sex-positive movement">Sex-positive movement</a></li> <li><a href="/wiki/Sexual_addiction" title="Sexual addiction">Sexual addiction</a></li> <li><a href="/wiki/Sexual_and_reproductive_health_and_rights" title="Sexual and reproductive health and rights">Sexual and reproductive health and rights</a></li> <li><a href="/wiki/Sexual_jealousy" title="Sexual jealousy">Sexual jealousy</a></li> <li><a href="/wiki/Sexual_norm" title="Sexual norm">Sexual norm</a></li> <li><a href="/wiki/Sexual_revolution" title="Sexual revolution">Sexual revolution</a></li> <li><a href="/wiki/Sexual_surrogate" class="mw-redirect" title="Sexual surrogate">Sexual surrogate</a></li> <li><a href="/wiki/Sexuality_and_disability" title="Sexuality and disability">Sexuality and disability</a></li> <li><a href="/wiki/Stanley_v._Georgia" title="Stanley v. Georgia">Stanley v. Georgia</a></li> <li><a href="/wiki/Women%27s_erotica" title="Women's erotica">Women's erotica</a></li></ul> </div></td></tr></tbody></table></div> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236075235"></div><div role="navigation" class="navbox" aria-labelledby="Human_physiology_of_sexual_reproduction385" style="padding:3px"><table class="nowraplinks mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239400231"><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Human_reproductive_physiology" title="Template:Human reproductive 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