The Crisan Chronicles

So in other words, we can say that biological sex differences exist, and also that our understanding of sex is socially constructed — these are not contradictory statements at all.

Saying that sex is “socially constructed” does not mean that biological sex differences do not exist or do not matter. It simply conveys that our definition of sex, and the way that we categorize people into sexes, is determined by society and our assumptions about how the world works.