Is anything a choice?
Is th fact that you like/dislike football a choice?
Is the fact that you like/dislike a certain food a choice?
Is the fact that you liked/disliked maths at school a choice?
Are any of these choices? Can you control them/ have more control over some choices than others?
I'll explain. Do we (humans) do things because we consciously have controlled our brains to want to do something, or is it the other way round, does something in our brain - in a way a pre determine our lives - do we have control over anything and just think that we do? I'm not sure about this but when people have brain injuries, they can turn into completely different people suggesting that it is the latter.
I've never heard of a brain injury induceing gayness but I wouldn't rule it out.
We may believe we are in control of our lives and personality, but really this could just be out brain doing it and we think we're in control when really we may not be. Who knows.