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Whatever the effect of FBOE on sexual orientation may be, it’s worth noting that it is only one of myriad potential factors contributing to sexuality, including hundreds (thousands?) of genes, biological but non-genetic factors affecting prenatal development in utero, and various aspects of our upbringing affecting us after birth.
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Any aspiring young researchers want to take a crack at that hypothesis? anally penetrated) by their female partners might be expected to have more older brothers than straight men who are convinced their anuses are a one-way street. If so, heterosexual men who like to get pegged (i.e. This suggests it might be something about the receptive anal role, rather than general psychological femininity, that is related to a later fraternal birth order. However, the new Canadian study measured participants’ gender-nonconformity in childhood and in adulthood, and found no link between gender-nonconformity and FBOE (only between anal sex role and FBOE). And much like a “booster shot,” each subsequent pregnancy with a Y-chromosome child only makes this maternal reaction stronger. Scientists don’t yet understand the exact mechanism, but they suspect that parts of the Y-chromosome of these fetuses causes an immunological reaction in some mothers these antibodies remain in her body, and later affect the brains of any future male fetuses in her womb in a way that makes them more likely to be gay. Specifically, the FBOE is about the number of male fetuses a mother has carried in her womb before her youngest son made his way in it, rather than the number of older brothers he is raised with after birth. Many scientists thought the same until a 2006 study looked at biological and nonbiological brothers separately, and found that FBOE is likely a nature thing, not a nurture thing.
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If this is your first time hearing about FBOE, you’re probably thinking this must be a Freudian effect (like, growing up with a bunch of older brothers emasculates the youngest brother, or something). (Also, these days families are relatively small, so the effect can be even harder to detect.) Only when you average over a large sample of gay and straight men’s number of older brothers will you find a statistically significant difference. This particular effect is also relatively small in size, so there will be many exceptions. Before you start protesting that you’re a gay guy and don’t have any older brothers, or that you have a few dozen straight male friends who have more older brothers than you do, let me remind you that this is true on average, meaning there will always be exceptions to the rule.