Incest is like gender... It is not a social construct.
Seriously, I can understand how some "progressive" minded people can try to claim that gender is a social construct (mixing gender and gender role as the same thing)
'Gender' was originally a grammatical term only. Fowler's
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,
the authority on prescriptivist English use, said in 1926: "To talk of persons or creatures of the masculine or feminine
gender, meaning of the male or female sex, is either a jocularity (permissible or not according to the context) or a blunder." It wasn't until the 1950s that
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, finding a need to distinguish between
biological sex and socially-assigned
sex roles, began using 'gender' as a way to refer to the latter. So 'gender' has
always been distinct from 'sex'.
tl;dr when conservatives tell you that 'sex' and 'gender' are the same thing, they're flat-out wrong, that's never been true.