How large is a penis supposed to be?
At some point in their lives, many young men are preoccupied with the size of their penis. Almost all males experience a growth spurt during puberty. By the age of seventeen or eighteen, a man’s penis will have reached its full adult size. The average size of a non-erect penis measures between two and four inches. When erect, a man’s penis normally measures from four to eight inches in length.
