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However, this difference was not hypothesized a priori, was not large, and was the only group difference found out of many tested. Chromosome linkage studies of sexual orientation have indicated the presence of multiple contributing genetic factors throughout the genome. This maternal immunization hypothesis MIH begins when cells from a male fetus enter the mother's circulation during pregnancy or while giving birth. These genes partly overlap with those for several other traits, including openness to experience and risk-taking behavior. While scientists do not know what determines an individual's sexual orientation , they theorize that it is caused by a complex interplay of genetic , hormonal , and environmental influences.

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The first group comprised 19 gay men who had died of AIDS -related illnesses.

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Romantic orientation Sociosexual orientation. Archived from the original PDF on This was a relevant area of the brain to study, because of evidence that it played a role in the regulation of sexual behaviour in animals , and because INAH2 and INAH3 had previously been reported to differ in size between men and women.

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