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we know its not genetic, identical twins can split on the issue

Studies involving identical male twins find that if the one twin is gay, the probability that the other twin is gay is 38% (if I remember correctly). This doesn't sound like much until you realize that only 2-4% of the male population is homosexual: so the probability that the identical twin of a gay man is gay is ten or more times more greater than normal. The same number for left-handedness is only 1.5 times more likely (8% of the male population is left-handed, and if a left-handed man has an identical twin, the twin has a 12% chance of being left-handed).

But of course, even though there appears to be a strong genetic component to homosexuality, it is certain that it doesn't cause homosexuality, it only increases the odds.

But the in uterus thesis I was suggesting could also be applicable here as a deficiency in the womb could affect both developing twins.

I would expect a true genetic feature would be much higher then ten times as high in identical twins. But I agree there could be something genetic in the mix. It simply would have to have a mechanism that is not completely genetic. Thus you have in the womb mechanisms such as a chemical deficiency during sexual identity development or a tramatic situation at a critical developmental period of the child's growth.

(Identical twin stats)

But of course, even though there appears to be a strong genetic component to homosexuality, it is certain that it doesn't cause homosexuality, it only increases the odds.

If h. was genetic then identical twins (who share the same genetic code) would be uniformly one or the other. The fact that they aren't point far more to environmental than to genetic. (that is if one twin is molested his brother is highly likely to be molested also)

If you could remove the common environmental aspects of it (that is, raise the twins separately) it would be easier to isolate any proposed genetic link. Of course it would be unethical to do so.

The causes of Same-sex Attraction Disorder (SAD) are very strongly documented. Absent or insufficient relationship with one's father, being molested or otherwise abused, relentless teasing by one's peers during the formative years. Every study suggesting a genetic cause or link has been debunked. Read scripter's database (linked priorly in this thread I believe) and get educated.

Homosexuality is a contagious mental disease passed from one molestor to his victim