Oh I know men can be witches.
The reason I want to add witchcraft to my game is because we both have a common interest in it, also the girl is very earth and I think would enjoy, finding herbs for rituals on full moons and things like that. More than likely we will LARP some of it.
I'm also trying to use witchcraft as a subtle magic, not something to build a character around but something to use for both flavor and a little boost to our small party.