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[–]MezozoicGaygay male 12 insightful - 1 fun12 insightful - 0 fun13 insightful - 1 fun -  (0 children)

If sex, male and female, exists in mammals but not in non-mammal species, then sex is a social construct.

No? A lot of things exist only in mammals (and few rare exception), like livebirth, for example. So pregnancy and birth now is a social construct and does not exist?

Second thing - sex exist in almost all species, even species that have hermaphrodites - are either one or another sex during reproduction. You still need an egg and a sperm to reproduce. And definition of sex is unified among all species, and covers them all, and it is real biological thing that can be very easily tested and proved, easily distinguished in 99.9% cases. Sex is a descriptor of a real world phenomena. You can't test social constructs, they are just social constructs, something created in a mind, not in physical world.