LogFAQs > #956090946

Based on the sole criterion of production of reproductive cells, there are two and only two sexes: the female sex, capable of producing large gametes (ovules), and the male sex, which produces small gametes (spermatozoa).

doesnt get more more scientific than that.
identify as whatever you want, thats cool. But no matter what, you are in fact, a male or a female. Unless you fall into the maybe 1% intersex category. (Sorry mods, this isnt an insult. dont think I can get dinged for quoting out of an article from the French National Centre for Scientific Research.)

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