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I'm not sure that can be said with certainty, perhaps it is cultural.

If it were something utterly intrinsic to Human Nature, there would be no opposition to it.

By that definition there is no true human nature.

Bingo

Reproduction is intrinsic to all life -- yes, including us humans -- and yet there are people who oppose it.

Words don't become sexy by themselves, they become sexy because they're labels for sexy things.