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The '''penis''' is the external male organ of urination and copulation.<refname="farlex2003">{{REFweb
|url=https://medical-dictionary.thefreedictionary.com/penis
|archived=
}}</ref> The penis is also known as the '''phallus'''.
The body of the penis consists of three cylindrical-shaped masses of erectile tissue which run the length of the penis. Two of the masses lie alongside each other and end behind the head of the penis. The third mass lies underneath them. This latter mass contains the [[urethra]]. The penis terminates in an oval or cone-shaped body, the glans penis, which contains the exterior opening of the urethra.<ref name="farlex2003" />
The [[glans penis]] is covered by a loose skin, the [[foreskin]] or prepuce, which enables it to expand freely during erection. The skin ends just behind the glans penis and folds forward to cover it. The inner surface of the foreskin contains glands that secrete a lubricating fluid called [[smegma]] which makes it easy for the penis to expand and retract past the foreskin.
|issue=
|pages=134-5
|url=http://www.cirp.org/library/normal/wright2/
|quote=The normal prepuce should be left alone, with no attempt to retract it until the boy is able to do it himself, at the earliest at three years of age.
|pubmedID=8295581