All dwarfs have beards and wear up to twelve layers of clothing. Gender is more or less optional.

Why was it that when she heard Granny ramble on about witchcraft she longed for the cutting magic of wizardry, but whenever she heard Treatle speak in his high-pitched voice she would fight to the death for witchcraft? She’d be both, or none at all. And the more they intended to stop her, the more she wanted it.She’d be a witch and a wizard too. And she would show them.

It's like chess, you know. The Queen saves the King.

It wasn't that dwarfs weren't interested in sex. They saw the vital need for fresh dwarfs to leave their goods to and continue the mining work after they had gone. It was simply that they also saw no point in distinguishing between the sexes anywhere but in private. There was no such thing as a Dwarfish female pronoun or, once the children were on solids, any such thing as women's work.

You can be any sex you like provided you act male. There's no men and women in the Watch, just a bunch of lads.