Straight Science?: Homosexuality, Evolution and Adaptation - download pdf or read online

By Jim McKnight

ISBN-10: 0203360478

ISBN-13: 9780203360477

ISBN-10: 0203377230

ISBN-13: 9780203377239

ISBN-10: 0415157722

ISBN-13: 9780415157728

A genetic foundation for homosexuality has been all yet proved, but Darwinism, the main commonly permitted evolutionary conception, emphasises profitable copy. How will we clarify a life-time choice for non-reproductive intercourse? while social constructionism deals reasons by way of social studying and cultural personal tastes, the physique of facts for a genetic predisposition to homosexuality grows. Social studying argues that gay intercourse is in basic terms misdirected and for that reason futile, yet faraway from loss of life out it maintains in the course of the a long time and is located in several cultures. What if there has been an evolutionary virtue to homosexuality? instantly technology? Homosexuality, Evolution and version dares to invite such questions.

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Additional info for Straight Science?: Homosexuality, Evolution and Adaptation

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1978) first identified sexually dimorphic areas in rodent brains and studies which are just now starting to identify differences in the brains of homosexual men (Swaab and Hofman, 1995). The first such human study, by Swaab and Hofman (1990) of the Netherlands Institute for Brain Research in Amsterdam, found clear differences in the suprachiasmatic nucleus (SCN) of the hypothalamus, which was twice as large in homosexual, compared to heterosexual men. This pioneering study was controversial, not the least in that the SCN is involved in regulating sleep and activity cycles in the mammalian brain and would 40 A BIOLOGY OF HOMOSEXUALITY seem to have little to do with sexual orientation.

The first such human study, by Swaab and Hofman (1990) of the Netherlands Institute for Brain Research in Amsterdam, found clear differences in the suprachiasmatic nucleus (SCN) of the hypothalamus, which was twice as large in homosexual, compared to heterosexual men. This pioneering study was controversial, not the least in that the SCN is involved in regulating sleep and activity cycles in the mammalian brain and would 40 A BIOLOGY OF HOMOSEXUALITY seem to have little to do with sexual orientation.

As the testes are critical to the sex drive, homosexual behaviour has to be switched on by injections of testosterone, or its derivative estradiol, after puberty. Estradiol appears to be the main activator and organiser of sexual behaviour, regardless of the animal’s sex or sexual orientation (Ellis and Ames, 1987; Breedlove, 1994). The differentiation mechanism, at least in lower mammalian species, is fairly clear. Testosterone is the main sex hormone involved in organising male orientation and activity.

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Straight Science?: Homosexuality, Evolution and Adaptation by Jim McKnight


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