Someone should make an EXTRA FILTHY random chat. : D
As for the topic at hand: Some studies indicate that homosexuality in men may be caused by the mother's body bombarding the fetus with estrogen because it doesn't recognize the Y chromosome or something like that. And apparently this gets stronger with the more male children you have, so the youngest boy is more likely to be homosexual. I don't have a source for this
but it sounds technical and I'm pretty sure it's true, so whatevs.
I'm also pretty sure that women have no genetic imperatives concerning preference. They can pretty much do whatever they want. Those bitches.