Gay chemical imbalance

It has been suggested that the greater the number of older male siblings the higher the level of androgen fetuses are exposed to. Differences in brain structure that come about from chemical messengers and genes interacting on developing brain cells are believed to be the basis of sex differences in countless behaviors, including sexual orientation. Some did not find any statistically significant difference in either the sibling composition or rate of older brothers of gay and straight men, [19] [20] including large, nationally representative studies in the US and Denmark. Such agents are not hormones. Endocrine disrupting chemicals EDCs are chemicals that, at certain doses, can interfere with the endocrine system in mammals.


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Prenatal hormones and sexual orientation

Ambrose

Some have postulated that postnatal e. They should not be expected to act precisely as hormones. The Rh gene hypothesis is a strong candidate because not only does it involve the maternal immune response, but it has been implicated in handedness as well. Due to relatively small population sizes, generalizability of studies on transsexuality cannot be assumed. A gene of the Rh system has been discussed as a possible candidate for affecting fraternal birth order, as it has been linked to both handedness and immune system functioning.


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Marc Breedlove; Kelly L. No evidence of birth order effects have been observed in women. They should not be expected to act precisely as hormones. According to some studies, gay men have more older brothers on average, a phenomenon known as the fraternal birth order effect. Last Reviewed, June 05, In a study, Simon LeVay demonstrated that a tiny clump of neurons of the anterior hypothalamus —which is believed to control sexual behavior and linked to prenatal hormones—known as the interstitial nuclei of the anterior was, on average, more than twice the size in heterosexual men when contrasted to homosexual men.


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