Gay choice or genetic

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Bailey , Nebraska Symposium on Motivation, Volume 54 p. Research conducted in Sweden [40] has suggested that gay and straight men respond differently to two odors that are believed to be involved in sexual arousal. They proposed that the answer may instead lie in epigenetics — the study of the chemical changes that can alter how the genetic code is expressed, without changing the genetic code itself. Women have two X chromosomes, one of which is "switched off". Hamilton and Mary Jane West-Eberhard. In the common fruit fly Drosophila melanogaster , the complete pathway of sexual differentiation of the brain and the behaviors it controls is well established in both males and females, providing a concise model of biologically controlled courtship. In Western cultures, they would be considered gay men and transgender women, respectively.
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Why Are People Gay? Gay By Choice or Is Being Gay Genetic? | HealthyPlace

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PET and MRI studies performed in have shown that the two halves of the brain are more symmetrical in homosexual men and heterosexual women than in heterosexual men and homosexual women. I think what is meant by 'not a choice' is that a man doesn't decide one day to be gay, he fancies other men whether he likes it or not. I don't really mind.
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