Nova
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I know a gay guy who has a twin sister(they were firstborns),and I can't help but wonder if that was a factor.(ie-too much female hormone overload?? or did it affect his brain development?) They were also premature,weighing less than 2 pds each.I wonder as well,if that was a factor..perhaps his brain didn't get a chance to fully develop in that area,and or,combined with having a twin sister in the womb,it could have been the combo of both.(his sister is straight,and married w children).
I think I read recently, that women that had a bro in the womb were more likely to not get married,or suffer from infertility.(someone correct me on that one if you know...it was one or the other).
Great posts, JMO!
Again, I'm not an expert or even really up on the latest literature. But to date I haven't heard of studies of fraternal twins. There are studies of identical twins which shows that even when they are raised apart, if one is gay, the other is much more likely to be gay. These results were important in suggesting a genetic basis for sexual orientation.
I think there almost have to be multiple causes, because sexual preference isn't really a simple, single trait (like eye color, say). We just talk about it as if it were.