Editing Human sexuality (section)

====Male anatomy and reproductive system====
{{main|Human male reproductive system}}

Males also have both internal and external genitalia that are responsible for procreation and sexual intercourse. Production of spermatozoa (sperm) is also cyclic, but unlike the female ovulation cycle, the sperm production cycle is constantly producing millions of sperm daily.<ref name="ReferenceA"/>{{page needed|date=February 2016}}

=====External male anatomy=====

The male genitalia are the penis and the scrotum. The penis provides a passageway for sperm and urine. An average-sized flaccid penis is about {{convert|3+3/4|inch|cm|abbr=out}} in length and {{convert|1+1/5|in|cm|abbr=out}} in diameter. When erect, the average penis is between {{convert|4+1/2|in|cm|abbr=out}} to {{convert|6|in|cm|abbr=out}} in length and {{convert|1+1/2|in|cm|abbr=out}} in diameter. The penis's internal structures consist of the [[shaft (penis)|shaft]], [[glans]], and the [[root]].<ref name="ReferenceA"/>{{page needed|date=February 2016}}

The shaft of the penis consists of three cylindrical bodies of spongy tissue filled with blood vessels along its length. Two of these bodies lie side by side in the upper portion of the penis called corpora cavernosa. The third, called the [[corpus spongiosum]], is a tube that lies centrally beneath the others and expands at the end to form the tip of the penis (glans).<ref name="ReferenceB">{{cite web|url=http://www.innerbody.com/image/repmov.html |title=Male Reproductive System – Explore Anatomy with Detailed Pictures |publisher=Innerbody.com |access-date=30 June 2013}}</ref>

The raised rim at the border of the shaft and glans is called the corona. The urethra runs through the shaft, providing an exit for sperm and urine. The root consists of the expanded ends of the cavernous bodies, which fan out to form the crura and attach to the pubic bone and the expanded end of the spongy body (bulb). The root is surrounded by two muscles: the [[bulbocavernosus muscle]] and the [[ischiocavernosus muscle]]. These aid urination and ejaculation. The penis has a [[foreskin]] that typically covers the glans; this is sometimes removed by [[circumcision]] for medical, religious or cultural reasons.<ref name="ReferenceA"/>{{page needed|date=February 2016}} In the scrotum, the testicles are held away from the body, one possible reason for this is so sperm can be produced in an environment slightly lower than normal body temperature.<ref>{{cite magazine|last1=Drew|first1=Liam|title=The Scrotum Is Nuts|url=http://www.slate.com/articles/health_and_science/science/2013/07/are_testicles_external_for_cooling_galloping_display_or_something_else.1.html|access-date=3 July 2015|magazine=[[Slate (magazine)|Slate]]|date=8 July 2013}}</ref><ref>{{cite book|last1=Madaras|first1=Lynda Madaras with Area|title=The what's happening to my body? book for boys|date=2008|publisher=Newmarket|location=New York|isbn=978-1-55704-765-6|edition=Rev.|url=https://books.google.com/books?id=zC1g5gdJc_kC&pg=PA33}}</ref>

=====Internal male anatomy=====

Male internal reproductive structures are the testicles, the duct system, the prostate and seminal vesicles, and the [[bulbourethral gland|Cowper's gland]].<ref name="ReferenceA"/>{{page needed|date=February 2016}}

The testicles (male gonads), are where sperm and male hormones are produced. Millions of sperm are produced daily in several hundred seminiferous tubules. Cells called the [[Leydig cell]]s lie between the tubules; these produce hormones called androgens; these consist of [[testosterone]] and [[inhibin]]. The testicles are held by the spermatic cord, which is a tubelike structure containing blood vessels, nerves, the vas deferens, and a muscle that helps to raise and lower the testicles in response to temperature changes and sexual arousal, in which the testicles are drawn closer to the body.<ref name="ReferenceA"/>{{page needed|date=February 2016}}

Sperm gets transported through a four-part duct system. The first part of this system is the [[epididymis]]. The testicles converge to form the [[seminiferous tubules]], coiled tubes at the top and back of each testicle. The second part of the duct system is the [[vas deferens]], a muscular tube that begins at the lower end of the epididymis.<ref name="ReferenceA"/>{{page needed|date=February 2016}} The vas deferens passes upward along the side of the testicles to become part of the spermatic cord.<ref name="ReferenceB"/> The expanded end is the ampulla, which stores sperm before ejaculation. The third part of the duct system is the ejaculatory ducts, which are {{convert|1|in|cm|abbr=out|adj=on}}-long paired tubes that pass through the prostate gland, where semen is produced.<ref name="ReferenceA"/>{{page needed|date=February 2016}} The prostate gland is a solid, chestnut-shaped organ that surrounds the first part of the urethra, which carries urine and semen.<ref name="ReferenceA"/>{{page needed|date=February 2016}}<ref name="ReferenceB"/> Similar to the female G-spot, the prostate provides sexual stimulation and can lead to [[orgasm]] through [[anal sex]].<ref name="Rosenthal">{{cite book |first=Martha |last= Rosenthal| title = Human Sexuality: From Cells to Society | publisher =[[Cengage Learning]]|year = 2012|pages=133–135| isbn = 978-0-618-75571-4|url =https://books.google.com/books?id=d58z5hgQ2gsC&pg=PT153}}</ref>

The prostate gland and the seminal vesicles produce seminal fluid that is mixed with sperm to create semen.<ref name="ReferenceA"/>{{page needed|date=February 2016}} The prostate gland lies under the bladder and in front of the rectum. It consists of two [[Portal:Main|main]] zones: the inner zone that produces secretions to keep the lining of the male urethra moist and the outer zone that produces seminal fluids to facilitate the passage of semen.<ref name="ReferenceB"/> The seminal vesicles secrete fructose for sperm activation and mobilization, prostaglandins to cause uterine contractions that aid movement through the uterus, and bases that help neutralize the acidity of the vagina. The Cowper's glands, or bulbourethral glands, are two pea-sized structures beneath the prostate.