In further support of a biological basis for homosexuality, this report demonstrates a newly-discovered biological connection between having several older brothers and being gay. The author suggests this as a possible reason:
One possibility is a maternal immune response to succeeding male fetuses. The mother may react to a male fetus as foreign but not to a female fetus because the mother is also female […] like the maternal immune response that can occur when a mother has Rh-negative blood but her fetus has Rh-positive blood. Without treatment, the mother can develop antibodies that may attack the fetus during future pregnancies.
– Anthony F. Bogaert
It seems pretty simple to me. Males are the gatekeepers to the female reproductive system. This says to me it is nature’s way of keeping reproduction and genetic perpetuation under control. If there are too many men carrying the same family genes who want to reproduce, the likelihood of crossing genes that are too closely related to each other increases down the line, and with it the possibility of genetic defects and immunodeficiencies.
Gay men make life better for heterosexual men like me, frankly I’m happy to have them around. Those of you with nagging wives and girlfriends should seriously look into getting one for her, as they can keep her safely entertained for hours while you watch the game, work on your car, or hang out with the guys.
I look forward to the day that a genetic basis for homosexuality is proven, so that women (and men, for that matter) will stop thinking that they can turn them around. There are lots of good hetero men out there ladies, you’re just wasting your time.
Lesbians on the other hand, there’s no doubt in my mind that there is a biological basis for it. But I don’t think it’s a biological predetermination in the same way it is for gay men.