It is usually the result of sexual stimulation , which may include prostate stimulation. Ejaculation may occur spontaneously during sleep known as a nocturnal emission or wet dream. A large-scale study assessing penis size in thousands of to year-old males found no difference in average penis size between year-olds and year-olds. A refractory period succeeds the ejaculation, and sexual stimulation precedes it. One of the primary ways in which a male's ejaculate has evolved to overcome sperm competition is through the speed at which it travels. Through increasing the amount he inseminates his partner following separation, a male increases his chances of paternal certainty. Men's and women's views on penis size across the lifespan". Genitourinary system Kidney Ureter Bladder Urethra. The raphe is the visible ridge between the lateral halves of the penis, found on the ventral or underside of the penis, running from the meatus opening of the urethra across the scrotum to the perineum area between scrotum and anus.
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