I'm not sure if there's a significant LGBTQ+ population on here, but I'm a part of that community. I don't believe that choice comes into it, because it would be easier to choose to be straight and/or cisgender. Some people's brains develop differently as they grow. There is some evidence for gender having a biological basis (Some journals talk about the chemical makeup of brains), but as for attraction/orientation, I don't know if there's been any research done on that.
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