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Originally posted by ChrisRTW
Go here and scroll down to twin studies
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Ok, I will.
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Most of these early studies suffered from methodological flaws.
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Shall I even bother reading further?
When studies suffer from methodological flaws that means the findings can't rightfully be applied to anyone.
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Twin studies suffer from the problem of trying to distinguish between environmental and genetic factors, since twins tend to live within the same family unit. A study examining the effect of birth order on homosexual preference concluded, "The lack of relationship between the strength of the effect and degree of homosexual feelings in the men and women suggests the influence of birth order on homosexual feelings was not due to a biological, but a social process in the subjects studied."12 So, although the twin studies suggest a possible genetic component for homosexual orientation, the results are certainly not definitive.
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I read on, and everything is inconclusive. The birth order thing is interesting... but I was born three months early by Cesarian-Section. I was originally supposed to be born 2nd, but was delivered 1st. So twins seem to complicate many of the studies that have been done on individuals.