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Accessed June 18, Archived from the original on The research consisted of 1, homosexual men and 1, heterosexual men. In the full sample they did not find linkage to Xq However, this difference was not hypothesized a priori, was not large, and was the only group difference found out of many tested. Hahaha this was a fun day.

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Hamilton and Mary Jane West-Eberhard.

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Also, the authors of the study acknowledge that a large number of sexual partners may not lead to greater reproductive success, specifically noting there is an "absence of evidence relating the number of sexual partners and actual reproductive success, either in the present or in our evolutionary past". University of California Press. Prenatal hormones and sexual orientation. Rights and legal issues. Retrieved June 12, Archived PDF from the original on 23 March Making Choices in a Diverse Society.

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Archives of General Psychiatry. One possible exception was the amygdala, in which homosexual men showed greater activational differences between preferred and nonpreferred erotic stimuli compared with heterosexual men. Sexual orientation and science Biology of gender Behavioural genetics. They argue that sexual orientation can shift over the course of a person's life. Principles and Practice of Psychiatric Nursing. There is no indication that social environment after birth has an effect on gender identity or sexual orientation. In many species, a prominent feature of sexual differentiation is the presence of a sexually dimorphic nucleus SDN in the preoptic hypothalamus, which is larger in males than in females.

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