actually homosexuality has been proven to be a chemical reaction...not persay a "matter of choice". Part of the glory of having intelligence, but also one of it's pitfalls is boredom and creativity...i'm sorry, but the missionary position is boring...sex with the same person is boring, so enter the creative aspect and a whole parade of kinks, fetishes, fantasies and all the delightful devices and toys that enhance sexual exploration...who wants to have sex just have babies, there's no fun in it it was a desire for sexual pleasure and the thrill of exploration that results in babies...except for those few that actually plan for such...deterents