Born to be gay

This will make a gender-conforming child feel different from opposite-gender children, while gender-nonconforming children will feel different from children of their own gender. A study, Garcia-Falgueras and Swaab asserted that "the fetal brain develops during the intrauterine period in the male direction through a direct action of testosterone on the developing nerve cells, or in the female direction through the absence of this hormone surge. These Y-linked proteins would not be recognized in the mother's immune system because she is female, causing her to develop antibodies which would travel through the placental barrier into the fetal compartment. Quoted in Bearman and Bruckner, For instance, there are variants that influence mating preference in mice and a mutation in the fruit fly makes males court other males instead of females. Since the hypothesis solves the problem of why homosexuality has not been selected out over thousands of years, despite it being antithetical to reproduction, many scientists consider it the best explanatory model for non-heterosexual behaviour such as homosexuality and bisexuality. We have many examples across many species.

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Born this way? An evolutionary view of ‘gay genes’

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He showed that pairs of brothers who were openly gay shared a small region at the tip of the X, and proposed that it contained a gene that predisposes a male to homosexuality. Several theories have been advanced to explain this contradiction, and new experimental evidence has demonstrated their feasibility. The results for INAH3 weight were similar to those for INAH3 size; that is, the INAH3 weight for the heterosexual male brains was significantly larger than for the heterosexual female brains, while the results for the gay male group were between those of the other two groups but not quite significantly different from either. 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". In some cases though, it appears that this switching off can occur in a non-random fashion. A meta-analysis of 48 studies showed childhood gender nonconformity to be the strongest predictor of a homosexual orientation for both men and women.

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The records of the remaining heterosexual subjects contained no information about their sexual orientation; they were assumed to have been primarily or exclusively heterosexual "on the basis of the numerical preponderance of heterosexual men in the population". Bem sought support from published literature but did not present new data testing his theory. It is speculated that environmental and hormonal stress factors linked to resource feedbacks may act as triggers. The biological theories reappraised". 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. Levay's research suggested that the hypothalamus of gay men is different from straight men. 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.

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