Are we born with it? Is it somehow in our genes? Does it have anything to do with hormones? Are there any external factors that can affect it?
In: Biology
We don’t know exactly, but it’s primarily prenatal hormones. Pretty much every marker we have for that, along with random gender linked stuff show a difference in straight/bi/gay individuals. There’s a genetic component, at least for men. But it’s not a simple inheritance case like or bloodtypes. A gay man identical twin is twice as likely to be gay that a fraternal twin (50 vs 25%).
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