Human beings are animals even though we tend to think ourselves superior to all other species. Man is the only animal that kills its own kind for no reason (i.e. not for need of food or survival). We have far removed ourselves from nature that we now deem anything that is different as " not natural". As for future propogation, perhaps homosexuality is Nature's way of controlling the world population. The planet is vastly overpopulated and Nature is just trying to find a balance.
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