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* Homosexuality in males is correlated with having older brothers and the more older brothers you have, the more likely you are to be gay. [[https://en.m.wikipedia.org/wiki/Fraternal_birth_order_and_male_sexual_orientation The most popular hypothesis for this phenomenon]] is that with each successive boy pregnancy, the mother's body begins to have an autoimmune reaction that produces antibodies against y-chromosome linked proteins. In a similar phenomenon, homosexuality in males has also been shown to run in those whose female [[https://www.sciencedaily.com/releases/2010/02/100204144551.htm relatives have more children]]. These predispositions together form the backbone of the so called "gay uncle hypothesis" which posits that in certain families who tend to have a lot of kids, it may be advantageous in the evolutionary sense for there to be a gay uncle (the genetics on female homosexuality are less clear) who doesn't produce offspring of his own but rather is there to act as help raising nieces and nephews to give them a better shot at making it to adulthood and therefore a better shot to pass on the genes.

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* Homosexuality in males is correlated with having older brothers and the more older brothers you have, the more likely you are to be gay. [[https://en.m.wikipedia.org/wiki/Fraternal_birth_order_and_male_sexual_orientation The most popular hypothesis for this phenomenon]] is that with each successive boy pregnancy, the mother's body begins to have an autoimmune reaction that produces antibodies against y-chromosome linked proteins. In a similar phenomenon, homosexuality in males has also been shown to run in those whose female [[https://www.sciencedaily.com/releases/2010/02/100204144551.htm relatives have more children]]. These predispositions together form the backbone of the so called "gay uncle hypothesis" which posits that in certain families who tend to have a lot of kids, it may be advantageous in the evolutionary sense for there to be a gay uncle (the genetics on female homosexuality are less clear) who doesn't produce offspring of his own but rather is there to act as help raising nieces and nephews to give them a better shot at making it to adulthood and therefore a better shot to pass on the genes.

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