There's both a genetic component and a social component. But the social component is predicated on open-mindedness, which may, itself, have a strong genetic component.
Anyway, I don't really get the moral argument that people use this for; whether they were born that way or chose to be that way, it's a right they should be allowed.
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H̓̇̅̉yͤ͏mͬ͂ͧn͑̽̽̌ͪ̑͐͟o̴͊̈́͑̇m͛͌̓ͦ̑aͫ̽ͤ̇n̅̎͐̒ͫ͐c̆ͯͫ̋ ̔̃́eͯ͒rͬͬ̄҉
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