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Sexual preference should be viewed, he insisted, as a behavioral variable, and the studies he and others have reported as studies of the genetic influence. Both effects are inconsistent with historical and empirical observations. To resolve the conundrum related to male homosexuality, there must be a genetic mechanism that compensates for the reduced fecundity of homosexuals and satisfies at least two fundamental conditions derived from empirical evidence: Evidence from First-born Homosexuals and Younger Siblings The identification of a balancing selective mechanism is complicated by the fact that fraternal birth order predicts an increase of older brothers due to a maternal effect in a family of homosexual probands. Whether and how long participants were reared with these siblings was also examined. Views Read Edit View history. The first study was a retrospective study of sex offenders, which included only those subjects whose clinical charts happened to contain birth order data so the results of the study may have been affected by selection bias.





A genetic study of male sexual orientation.

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Fecundity of Paternal and Maternal Non-Parental Female Relatives of Homosexual and Heterosexual Men

A correlation between fraternal birth order and male sexual orientation has been suggested by research. The adherence to this common, but confounding rule obliged the authors to limit their results only to right-handed and non-last-born homosexuals to determine fraternal birth order effects. Tuesday 12 February Implications for the kin selection hypothesis. Female Fecundity Increase in the Maternal Line. Thus, we suggest that these data are not compatible with the overdominance hypothesis.

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Introduction The origin and causes of male homosexuality remain largely debated, and several mechanisms have been proposed to explain this condition. Human development Human sexuality Sibling. Research over the years has established several facts. Fecundity Compensation via Kin Selection In the early s, Trivers and Wilson proposed the idea of fecundity compensation through kin selection [22][23]suggesting that while subjects might not reproduce directly, increased fecundity in close relatives is promoted through direct support and assistance to close relatives who share genes, thus compensating for the lower reproductive rate observed among homosexuals. The evidence-based assumption of even a partial genetic predisposition for homosexuality in males generates evolutionary questions and presents several factors that contradict the Darwinian assumption that natural selection should progressively eliminate factors reducing individual fecundity and fitness.