编辑“︁精液”︁（章节）

=== 外觀和濃度=== 
[[File:Human semen in petri dish.jpg|thumbnail|培養皿中的人類精液]]
精液通常是半透明的，並帶有白色、灰色或淡黃色的色調。若精液帶血，則可能呈粉紅色或微紅色，此一情況一般稱為[[血性精液]]；一旦持續發生血性精液的情況，當事人便有可能需尋求醫療協助，以找出潛在問題<ref>{{cite web|url=http://www.healthcentral.com/prostate/question-answer-27466-63.html|title=HealthCentral.com - Trusted, Reliable and Up To Date Health Information|publisher=|accessdate=30 December 2016|archive-date=2014-04-17|archive-url=https://web.archive.org/web/20140417212146/http://www.healthcentral.com/prostate/question-answer-27466-63.html|dead-url=yes}}</ref>。

後半部分的精液會於射精後不久便會凝固成凝膠狀或果凍滴状物质<ref name="Gallup, Gordon G; Burch, Rebecca L 2004">{{Cite journal |author1=Gallup, Gordon G |author2=Burch, Rebecca L |title=[Semen Displacement as a Sperm Competition Strategy in Humans] |journal=Evolutionary Psychology |volume=2 |issue=5 |pages=12–23 |year=2004 |url=http://evp.sagepub.com/content/2/1/147470490400200105.full.pdf+html |accessdate=January 10, 2012 |archive-date=2016-10-24 |archive-url=https://web.archive.org/web/20161024081408/http://evp.sagepub.com/content/2/1/147470490400200105.full.pdf+html |dead-url=yes }}</ref><ref>{{cite web | last = Dean | first = Dr. John | title = Semen and sperm quality | url = http://www.netdoctor.co.uk/menshealth/facts/semenandsperm.htm | accessdate = December 7, 2006 | archive-url = https://web.archive.org/web/20151108042900/http://www.netdoctor.co.uk/menshealth/facts/semenandsperm.htm | archive-date = 2015-11-08 | dead-url = yes }}</ref>，前半部分所射出來的精液則一般不會凝固<ref name="Baker, Robin R; Bellis, Mark A 1993">{{cite journal |doi=10.1006/anbe.1993.1271 |title=Human sperm competition: Ejaculate adjustment by males and the function of masturbation |year=1993 |last1=Baker |first1=R |journal=Animal Behaviour |volume=46 |issue=5 |page=861}}</ref>。一般經過15-30分鐘後，精液中的[[前列腺特异抗原]]便會使其解凝<ref name="pmid12525533">{{cite journal |doi=10.1200/JCO.2003.02.083 |title=Biology of Prostate-Specific Antigen |url=https://archive.org/details/sim_journal-of-clinical-oncology_2003-01-15_21_2/page/382 |year=2003 |last1=Balk |first1=S. P. |journal=Journal of Clinical Oncology |volume=21 |issue=2 |pages=383–91 |pmid=12525533 |last2=Ko |first2=YJ |last3=Bubley |first3=GJ}}</ref>。研究者推測，初始凝固有助精液保留於陰道內<ref name="Gallup, Gordon G; Burch, Rebecca L 2004"/>；而隨後的液化便會使精子釋放，助其移動至卵子的所在部分<ref name="Gallup, Gordon G; Burch, Rebecca L 2004"/>。

一篇於2005年發表的綜述發現，一般文獻會視精液的粘度為3-7[[泊 (單位)|釐泊]]<ref name="Owen2005" />。