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It's different to the finger ratio thing.
But there is good evidence to suggest that male homosexuality is an epigenetic phenomenon (which is it is like a side effect of a combination of certain genes rather than the adaptive traits associated with those genes) and there are multiple pathways to it.
Interestingly one is the number of older brothers. They call it "the older brother effect" LOL. Everytime a woman has a son (and it is associated with the mother not the father btw) her half of the genes check to see which variable to go with and the odds are stack in the favour of heterosexual. But each time the variable needs checking the bias of those odds is reduced. from memory it is estimate that this mechanism account for like 20% of the gay population. Similarly, whatever is going on that makes someone left handed is connected to the process of sexual preference too, so that lefties are more likely to be gay than righties. (15% or so)
But here's the weird thing. They don't stack up. The older brother effect only comes into play for righties.
So, if you were left handed you could answer the question with "probably because of my handedness" but you are not so you could say "it's my stupid older brother's fault" or alternatively "it's my Mum's fault".
http://en.wikipedia.org/wiki/Fraternal_birth_order_and_male_sexual_orientationhttp://en.wikipedia.org/wiki/Handedness_and_sexual_orientation
Topic: Girls Vs Boys (Read 160496 times)