I hate it when people generalize genders outside of physical evolutionary lines.
There isn't some kind of separate organ in the skulls of men as opposed to women: both genders are equipped with BRAINS, which work in vaguely the same way.
Lesbians sure can live without men ... though it seems to me that lots of gay men can't live without women. I'm a notorious hag, and all my boys seem to like it that way :3

Hormones affect the way your brain works. Men and women have different hormones/levels. Biological imperitives (instinctual) for men and women are different. They had to be for our species to survive and get to where it is now.

These are physical things that form a difference in our thinking. I definately think that men and women aren't the same in the mind.

Camp men can't live without women because men don't like them, they'd have no friends otherwise. Also, they strive to be womanly so hanging out with women makes sense...

Straight acting gay men would be a different case, I think.