Rincewind, as it has already been noted, was the worst wizard on the Disc: no other spells would stay in his mind once the Spell had lodged in there, in much the same way that fish don't hand around in a pike pool. But he still had his pride, and wizards don't like to see women perform even simple magic. Unseen University had never admitted women, muttering something about problems with the plumbing, but the real reason was an unspoken dread that if women were allowed to mess around with magic they would probably be embarrasingly good at it...