People. There are more than two sexes. There are more than two genders. This is not a political statement. It's just reality.
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I didn't deny there are 2 gametes, I said its an impractical way to define sex in many settings.
_Defining_ sex by gamete size is the most reasonable thing in terms of evolutionary biology. _Recognizing_ sex is something different, and can be based on many correlated cues.
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Apologies, I'll make sure to bring along my DNA testing kit the next time I want to be sure of someone's gender/sex.
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Exactly.
End of conversation
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