Re: does strict separation of the sexes promote homosexuality?
I see your point. In the areas you've mentioned I think homosexuality is not because it's the preferred lifestyle but out of sheer drive for sex. As you said segregation keeps them from getting to know the opposite gender and once they hit the teens, they need an outlet. Some of the well to do middle class boys would end up taking their frustration out by watching x-rated movies and stuff. But the poor people living in the remote villages have no form of entertainment available to them. Out of frustration and not knowing the better option they end up in homosexual activity. It is mostly temporary however as they give up as soon as they get married.
Now this is only true for a very minute percentage of the population and most people live without any sex well into their thirties. I think.