Re: No, it's Nature.

"Girls and boys have VERY different bodies. I happen to like both. But anyone who says they look the same has immediately thrown all credibility out the window. They look as much the same as a turtle and a cheetah."
Well, this does not illustrate the range of diversity for either sex...
Say you look at a primary school class lined up at a pool. Short hair for all, and swimming trunks for all with no chest covers. Looking at the backs and butts, is it generally unmistakable to tell apart the 15 who are boys and 15 who are girls? Or would you have, in an average class, one or more of the 15 girls whom you could mistake for a boy, or boys whom you could mistake for a boy?