The origin of my sexuality has never really kept me up at night, but I think it bothered the parents quite a bit when I came out. Great news folks: a recent study written up in the LA Times says it's not your "fault" [sic] after all:
Having one or more older brothers boosts the likelihood of a boy growing up to be gay — an effect due not to social factors, but biological events that occur in their mother's womb, according to a study published today.
In an analysis of 905 men and their siblings, Canadian psychologist Anthony Bogaert found no evidence that social interactions among family members played a role in determining whether a man was gay or straight.
The only significant factor was the number of times a mother had previously given birth to boys, according to the report in the Proceedings of the National Academy of Sciences.
The so-called fraternal birth order effect is small: Each older brother increases the chances by 33%. Assuming the base rate of homosexuality among men is 2%, it would take 11 older brothers to give the next son about a 50-50 chance of being gay.
I have three older brothers, but I'm bad at math, so that leaves me at about an "eh, probably gayer than the rest" chance of gayness, but at least I fit the model.
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