Choice ?
No. I cannot see that : .....where is my goddamned timetable ?! I have trouble to remember if I'm supposed to be straight on Wednesdays !
Genetically determined ?
What exactly do you mean ? Some genetic error ? In humans , homosexuality is much to common for it to be considered a genetic defect ! Real genetic diseases are really rare. And their frequency depends on their severity .
So , I will go with environment and social trait . Homosexual contact is a way to communicate pleasure.
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