Gay twin studies

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Kallmann FJ April Most of the data suggests that homosexual rams, like female-oriented rams, are masculinized and defeminized with respect to mounting, receptivity, and gonadotrophin secretion, but are not defeminized for sexual partner preferences, also suggesting that such behaviors may be programmed differently. This latest research overcomes the problems of three prior studies which did not find the same results. Psychological Science in the Public Interest. Quoted in Bearman and Bruckner, Is There a Role for Epigenetics? In 10 of the pairs studied, both twins identified as homosexual.
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Twin brothers separated at birth reveal striking genetic similarities - CBS News

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Twin brothers separated at birth reveal striking genetic similarities

Retrieved 19 August Much literature on mental health and homosexual patients centered on their depression , substance abuse , and suicide. First in and then again in , a research group hypothesized that canalizing sexually antagonistic epigenetic marks that are produced during early ontogeny might influence development and possibly sexual orientation Rice, Friberg, and Gavrilets ; Rice, Friberg, and Gavrilets , although no evidence directly supporting the hypothesis was provided.
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