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McConaghy, N. Just because there is a genetic link to homosexuality, it does not necessarily guarantee one will end up gay. For females, predicted sexual orientation effects fall between 0. Chad Zawitz Chad Zawitz is a senior physician at a clinic in Chicago, coordinating services for people with HIV and other infectious diseases. Sex differences in patterns of genital sexual arousal:

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Having said this, it is more likely that oSDN morphology and homosexuality may be programmed through an androgen receptor that does not involve aromatisation.

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Sexual practices that significantly reduce the frequency of heterosexual intercourse also significantly decrease the chances of successful reproduction, and for this reason, they would appear to be maladaptive in an evolutionary context following a simple Darwinian model competition amongst individuals of natural selection—on the assumption that homosexuality would reduce this frequency. Evidence that sexual orientation is biologically determined and therefore perhaps immutable in the legal sense would strengthen the legal case for heightened scrutiny of laws discriminating on that basis. The Royal College of Psychiatrists.

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The early fixation hypothesis includes research into prenatal development and the environmental factors that control masculinization of the brain.

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