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Erection. Three columns of erectile tissue make up most of the volume of the penis. An erection (clinically: penile erection or penile tumescence) is a physiological phenomenon in which the penis becomes firm, engorged, and enlarged. Penile erection is the result of a complex interaction of psychological, neural, vascular, and endocrine factors ...
Category: Ejaculation. 19 languages. ... Wikimedia Commons; Help. See also: All pages with titles containing Ejaculation. Subcategories. This category has the ...
