Erection - Simple English Wikipedia, the free encyclopedia
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Category:Close-up photographs of human penises
The human penis is an external male intromittent organ that additionally serves as the urinal duct. The main parts are the root radix ; the body corpus ; and the epithelium of the penis including the shaft skin and the foreskin prepuce covering the glans penis. The body of the penis is made up of three columns of tissue : two corpora cavernosa on the dorsal side and corpus spongiosum between them on the ventral side. The human male urethra passes through the prostate gland , where it is joined by the ejaculatory duct , and then through the penis.
Human penises vary in size on a number of measures, including length and circumference when flaccid and erect. Besides the natural variability of human penises in general, there are factors that lead to minor variations in a particular male, such as the level of arousal , time of day, room temperature, and frequency of sexual activity. Compared to other primates, including large examples such as the gorilla, the human penis is thickest, both in absolute terms and relative to the rest of the body. Measurements vary, with studies that rely on self-measurement reporting a significantly higher average than those with a health professional measuring. As of [update] , a systematic review of 15, men, and the best research to date on the topic, as the subjects were measured by health professionals, rather than self-measured, has concluded that the average length of an erect human penis is