Those videos I posted up there actually do a pretty good job of summarizing advances made in uncovering the mystery that is homosexuality anno 2006.
I realize most probably won't be arsed with watching it, but they point out that homosexuality is not simply a behaviour, but also a physiological characteristic. They say nurture as the cause has been disproven, but that genetic components and the environment in the mothers womb during pregnancy are important factors. Needless to say, these factors play their role before the child is born.
It's also demonstrated how one can make rats sexually behave like the opposite sex; if females are administered testosterone at birth or males if they are castrated at birth, depriving them of testosterone. Rats are not humans, but it is indicative of how hormones may affect development.
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