I always thought of gender as the social expression of sex which is why it is a social construct. I don't use social construct to mean fake or unnecessary as it tends to be used today, I mean the plain definition: an idea that has been created and accepted by the people in a society. Gender is how we make sense of sex, sexual dynamics, and sex differences.

Current gender theory says that way is confining and there are actually perhaps infinite genders based on how someone views themself. It's usually talked about as something to be explored and something very personal. It sounds a lot like gender navel gazers theorists might have confused gender with personality, but maybe that's unfair of me.