It's a little like self-hating women, I suppose. And it's interesting that you'd have seen boys as the norm, because when I was small I always thought that girls were the default, and that boys were the deviation--I believe because the male genitalia seem like an add-on.

I do the balancing act, too. Usually I just do whatever I like either way, but with a few really girly things like this it can get a little rocky. I try to integrate both personae ("girly" and "boyish"), but you're right, the fact that they're separated says a great deal.