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It is speculated that environmental and hormonal stress factors linked to resource feedbacks may act as triggers. Volume 1: The hypothesis is consistent with other studies on homosexuality, which show that it is more prevalent amongst both siblings and twins. As both blood type and Rh factor are genetically inherited traits controlled by alleles located on chromosome 9 and chromosome 1 respectively, the study indicates a potential link between genes on autosomes and homosexuality. There have also been reports of variations in brain structure corresponding to sexual orientation. May

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Sexual orientations Asexual Bisexual Heterosexual Homosexual. The researchers found a significant difference in INAH3 size between heterosexual men and heterosexual women. New York City: A conceptual analysis and quantitative review".

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