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Sie JA, Blok BF, de Weerd H, Holstege G (2001). "Ultrastructural evidence for direct projections from the pontine micturition center to glycine-immunoreactive neurons in the sacral dorsal gray commissure in the cat". J. Comp. Neurol. 429 (4): 631–7. doi: 10.1002/1096-9861(20010122)429:4<631::AID-CNE9>3.0.CO;2-M. PMID 11135240. S2CID 7570375. Morris BJ, et al. (2016). Erratum to: Estimation of country-specific and global prevalence of male circumcision. a b c d e Moller, A. P. (1988). "Ejaculate quality, testes size and sperm competition in primates". Journal of Human Evolution. 17 (5): 479–488. doi: 10.1016/0047-2484(88)90037-1. Baker, R. Robin; Bellis, Mark A. (1989-05-01). "Number of sperm in human ejaculates varies in accordance with sperm competition theory". Animal Behaviour. 37 (Pt 5): 867–869. doi: 10.1016/0003-3472(89)90075-4. S2CID 53183250.
Human penis - Wikipedia
In males the expulsion of urine from the body is done through the penis. The urethra drains the bladder through the prostate gland where it is joined by the ejaculatory duct, and then onward to the penis. At the root of the penis (the proximal end of the corpus spongiosum) lies the external sphincter muscle. This is a small sphincter of striated muscle tissue and is in healthy males under voluntary control. Relaxing the urethra sphincter allows the urine in the upper urethra to enter the penis properly and thus empty the urinary bladder. Thornhill, Randy; Gangestad, Steven W. (2008). The evolutionary biology of human female sexuality. Oxford; New York: Oxford University Press. ISBN 9780199712489.Penis panic ( koro in Malaysian/ Indonesian) — delusion of shrinkage of the penis and retraction into the body. This appears to be culturally conditioned and largely limited to Ghana, Sudan, China, Japan, Southeast Asia, and West Africa. Cold glans syndrome is a condition marked by the persistent inability of the glans penis to maintain an erect state during sexual arousal, potentially leading to reduced sensitivity and erection difficulties. A 2013 study of 253 men from Tanzania found that the average erect penis length of Tanzanian males was 13.12cm (5.17 inches) [15]
Types of penises: Shape, size, circumcision, and more
Some infants can be born without a foreskin, which is a condition called hypospadias. Here, the opening of the penis is not found at the tip. Surgery is usually required to correct this issue. An erection is the stiffening and rising of the penis, which occurs during sexual arousal, though it can also happen in non-sexual situations. Spontaneous erections frequently occur during adolescence due to friction with clothing, a full bladder or large intestine, hormone fluctuations, nervousness, and undressing in a nonsexual situation. It is also normal for erections to occur during sleep and upon waking. (See nocturnal penile tumescence.) The primary physiological mechanism that brings about erection is the autonomic dilation of arteries supplying blood to the penis, which allows more blood to fill the three spongy erectile tissue chambers in the penis, causing it to lengthen and stiffen. The now-engorged erectile tissue presses against and constricts the veins that carry blood away from the penis. More blood enters than leaves the penis until an equilibrium is reached where an equal volume of blood flows into the dilated arteries and out of the constricted veins; a constant erectile size is achieved at this equilibrium. The scrotum will usually tighten during erection. Pearly penile papules are raised bumps of somewhat paler color around the base (sulcus) of the glans which typically develop in males aged 20 to 40. As of 1999, different studies had produced estimates of incidence ranging from 8 to 48 percent of all men. [18] They may be mistaken for warts, but are not harmful or infectious and do not require treatment. [19] Hyde, Janet; DeLamater, John D. (2016). Ebook: Understanding Human Sexuality. McGraw-Hill Education. p.94. ISBN 978-0-07718-512-1 . Retrieved October 28, 2023.With no angles to accommodate, you can eenie-meenie-miney-mo your way through every sex position you both consent to with little-to-no tweaking required. Research has shown that males produce larger ejaculates containing better, more motile sperm when mating with a higher quality female. [45] This is largely to reduce a male's sperm competition, since more attractive females are likely to be approached and subsequently inseminated by more males than are less attractive females. Increasing investment in females with high quality phenotypic traits therefore acts to offset the ejaculate investment of others. [50] In addition, female attractiveness has been shown to be an indicator of reproductive quality, with greater value in higher quality females. [51] It is therefore beneficial for males to increase their ejaculate size and quality when mating with more attractive females, since this is likely to maximise their reproductive success also. Through assessing a female's phenotypic quality, males can judge whether or not to invest (or invest more) in a particular female, which will influence their subsequent ejaculate adjustment.
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