This is a huge area of debate. And nearly time for a beer. But before I go: William Golding said of his book Lord of the Flies, this when asked why they weren't all girls:

“A group of little boys are more like a scaled down society than a group of little girls will be.

“This has nothing to do with equality at all,” he continued. “I think women are foolish to pretend they’re equal to men – they’re far superior, and always have been. But one thing you can not do with them is take a bunch of them and boil them down into a set of little girls who would then become a kind of image of civilization, or society. That’s another reason why they aren’t little girls.”

Cheers!