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The second group comprised 16 men whose sexual orientation was unknown, but whom the researchers presumed to be heterosexual. Sexual behavior is widely diverse and governed by sophisticated mechanisms throughout the animal kingdom. Bibcode : PNAS.. Questions will follow the presentation. I think most people now have friends or acquaintances who are gay. In many such places, the struggle for freedom today is not primarily for people who want to identify themselves as gay or lesbian, but for people who want to avoid or resist such an identification for themselves. Bem theorizes that this psychological arousal will later be transformed into sexual arousal: children will become sexually attracted to the gender which they see as different "exotic". By way of analogy, the allele a particular version of a gene which causes sickle-cell anemia when two copies are present, also confers resistance to malaria with a lesser form of anemia when one copy is present this is called heterozygous advantage.
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Are People Born Gay? Genetics and Homosexuality


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Brendan Zietsch of the Queensland Institute of Medical Research proposes the alternative theory that men exhibiting female traits become more attractive to females and are thus more likely to mate, provided the genes involved do not drive them to complete rejection of heterosexuality. Retrieved 20 March Neuroscience and Biobehavioral Reviews. These genes partly overlap with those for several other traits, including openness to experience and risk-taking behavior.
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