Penises come in all shapes and sizes. But the average length of an erect, adult penis is between five and seven inches. Because teen boys' bodies are growing through puberty, there is no accurate average size for younger guys. Most guys reach their full adult penis size by the time they get into their early 20s.

A lot of guys get hung up on the size of their penis. But the truth is that size doesn't matter that much when it comes to being able to give or receive sexual pleasure. Pleasing a partner is not about the size and shape of body parts, but being with the right person for you.