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Xyze
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The vast majority of studies show a large range of influences that can affect a persons sexuality. No single factor can be cited as the sole cause for sexual orientation.
However, studies such as Twin Studies show that genetic factors are most likely to be the predominant cause.
(List: http://www.tim-taylor.com/papers/
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The largest twin study was the Bailey & Pillard study which found a 52% concordance of homosexuality between monozygotic (Identical) twins.
(When an identical twin is homosexual, 52% of the time the other twin is also homosexual.)
Similar studies also found that between dizygotic twins (twins that share ~50% genetic information) the 52% figure drops
(22% in the Bailey & Pillard study), but is still about double the normal occurrence.
The important thing that these studies show is that there is a significant link between genetics and sexual orientation. The more genetically similar two people are, the more likely they share the same sexual orientation.
If homosexuality was caused by environmental factors then there shouldn't be any difference between homosexuality between monozygotic and dizygotic twins - Yet there is a difference of 30%.
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