But are they right? That claim might sound strange. It goes like this:. There are exactly two kinds of people. One kind, men, have a penis, testes, and XY chromosomes, and the other kind, women, have a vulva, uterus, breasts, and XX chromosomes.

Back to Sexual health. Puberty can be a confusing time, because your body and your feelings are changing as you grow up. Here are answers to some of the questions that boys often ask about their bodies. Puberty describes all the physical changes that children go through as they grow into adults. Most men's penises are somewhere around 9cm 3.

Ah, men. We're a simple creature sometimes. And we're never simpler than when we're thinking about size.