There are two genders.

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[–]JasonCarswellMental Orgy 2 insightful - 2 fun2 insightful - 1 fun3 insightful - 2 fun -  (1 child)

Yet the human species remains bipedal, with 2 sexes.

[–]C3P0 2 insightful - 2 fun2 insightful - 1 fun3 insightful - 2 fun -  (0 children)

Because no one is crazy enough to breed only non-bipedal humans.