Odds of having gay twins
A correlation between fraternal birth order and male sexual orientation has been suggested by . Thus, if a male with no older brothers has a 2% chance of being homosexual and not alter the likelihood of being gay in left-handed and ambidextrous men.
"Opposite-sex twins and adolescent same-sex attraction" (PDF).
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1 Jun The fact that identical twins have the same DNA and fraternal twins share “Our studies showed that it significantly increased the odds of being.
Fraternal birth order and male sexual orientation - Wikipedia
Arch Sex Behav. Jun;22(3) Homosexual orientation in twins: a report on 61 pairs and three triplet sets. Whitam FL(1), Diamond M, Martin J.
Description:This has been reported in samples from Canada, [66] the United Kingdom, [62] the Netherlands, [67] and Polynesia. Participants were also asked "How sexually attracted are you to women? If a prenatal factor underlies the fraternal birth order effect, then biological older brothers with whom the participants were not reared should still predict sexual orientation because all biological older brothers, even those not reared with the participants, share prenatal characteristics e. The results of the meta-analysis confirmed the reliability of the fraternal birth order effect. Correlative studies suggest that these mechanisms are also at play in humans. Individuals who identified having any same-sex sexual partner i.
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