Hi for the record I have two elder brothers by 10 and 8 years respectively both straight. I have a second cousin who is gay and he has an elder brother who is straight.
Interesting angle of study. I have heard other theories that suggest in utero hormones might have an affect on a fetus. But this is the first study I've heard of that links "anti-male" anti-bodies to homosexuality. But that certainly doesn't explain lesbians.FWIW, I have 2 younger brothers: one gay, one straight. I also have a male cousin on my mom's side who is gay.
I am gay, and the oldest in my family. I have two younger brothers.I also have a few gay cousins.
No Brother Factor for you then, Chuck.