Two genders and two sexes, Nick. We have known this for literally a hundred thousand years. It is settled science and settled biology.
To argue otherwise you may as well argue that the Earth is really flat.....
For 99.9% of the world sex and gender will match.
That's utter 'dangle berries'! Once again, gender and sex are grammatical and biological terms respectively.
English is unusual in that we
only apply genders to things that have a sex - other languages can use male and female pronouns with the same word to refer to entirely different objects. Saying that a table is masculine, or a girl is neuter is ridiculous to us but correct in German. That same table is feminine in French....
Most of the time a person's sex is irrelevant, like a teacher/student/criminal/driver/etc, and they should be neuter permanently, even if you know that the 150kg tattooed behemoth who stole your dinner set is a woman. That's the way we're headed, and it isn't a bad thing.