Background: A tad of gay holds. sway. How homosexuality, though associated with fewer offspring, can evolve by the backdoor. https://plus.google.com/u/0/101046916407340625977/posts/bKP5RddNaUQ …
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What twin studies say about the heritability of homosexuality, and why the data aren't yet good enough to draw strong conclusions. And I would love to bet my money on the larger concordances. https://www.amazon.com/Gay-Straight-Reason-Why-Orientation/dp/0190297379/ref=sr_1_1?s=books&ie=UTF8&qid=1512140795&sr=1-1&keywords=straight+gay …pic.twitter.com/ZYaVbtFkDl
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They - unfortunately way too few - examples of homosexuality in identical twins reared apart are also very interesting. https://www.amazon.com/Gay-Straight-Reason-Why-Orientation/dp/0190297379/ref=sr_1_1?s=books&ie=UTF8&qid=1512140795&sr=1-1&keywords=straight+gay …pic.twitter.com/kR3mft4WSV
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How strong is the data on the greater fecundity of relatives of gay men?
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The trend has been replicated several times http://cshperspectives.cshlp.org/content/7/4/a017657.full … and I haven't seen a single negative result. Still I would love to see a good meta-analysis. Same goes for concordance in identical twins. I bet it is higher than assumed.pic.twitter.com/xGbUbbNYdS
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By the way, if prenatal hormonal feminization was the cause of homosexuality, concordance in identical twins would have to be higher, as most (70%) share one placenta, the same hormonal milieu.
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I don't believe that natural selection would let stand a mechanism that drastically reduces reproductive success dependant on random, idiosyncratic experiences - at least without a compensatory benefit.
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There is a theory that gayness in men increases the success of the greater family unit, as they help raise kids and are often able to better relate to both men and women.
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And that is what I do not buy. Natural selection would eradicate any mechanism making sexual orientation (and thus, fitness) dependant on idiosyncratic events.
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@realDonaldTrump Бела съм, бела юначе / I'm white, my hero/ Радка Кушлева https://www.youtube.com/watch?v=P6uDxMEg7o8 …pic.twitter.com/h93w3Bh4Ne
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