It's just yet another example of gender-related behavior. It'd be actually nice to have stats on FOSS participation for LGBTs.
>If genes determine our sexual orientation we would expect that in cases of identical twins where one was gay the other would be gay too – in every case
No, that's incorrect - genes rarely work as an on/off switch. Mostly they influence the probability of a certain phenotypic attribute.
However twins (even separated twins!) do have a high level of correlation for LGBT behavior ( http://borngay.procon.org/view.answers.php?questionID=000019 ). As far as I remember, about 60% of gender-related variability can be attributed to genetic factors.
So genetic factors do influence behavior. Is it too far-fetched to think that they influence preference for science/math?
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