Human genetics – sexual reproduction, chromosomes, how it works; genes, what can go wrong. Sexual development, disorders and gender identity! Masses of information, some guaranteed surprises, pictures, videos and loads of links. Clue yourself in.
Biological sex affects every part of us, down to the cellular level. The internet’s full of misinformed nonsense – and, worryingly, even medical science doesn’t know the half of it. Real physical differences between women and men are too far-reaching to cover in depth but I’ll try to be comprehensive. Part 1: structure. Skeleton, head, muscles.