There are two genders.

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[–]NeedMoreCoffee 7 insightful - 3 fun7 insightful - 2 fun8 insightful - 3 fun -  (3 children)

Intersex people are male or female too...

[–]C3P0 2 insightful - 3 fun2 insightful - 2 fun3 insightful - 3 fun -  (2 children)

That depends on the person determining their sex. If one starts making concrete rules such as "penis = male" or "XX = female". Then you end up with contradictions.

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

That depends on the person determining their sex. If one starts making concrete rules such as "penis = male" or "XX = female". Then you end up with contradictions.

Male = small gametes, female = big gametes. That's how biology differentiates sexes. And that ability does not appear out of nowhere, so disorder in its development do exist, but this does not negate the fact that there are only two sexes. Just like people born without legs do not negate the fact that humans are bipedal.

[–]C3P0 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (0 children)

That's how biology differentiates sexes.

There's no law that states a species is limited to two sexes, male and female. There may be organisms with three sexes. Or even more.

Also, if you breed humans that are born without legs long enough, then humans will indeed have a species that is not bipedal.