A roundup of comments from a survey of more than 200 magicians (fewer than 5% of whom were female).
Women have to invent for themselves ways to do things that men do not. Most magic instruction is designed for men with jackets. Women’s clothes don’t have pockets and women can’t reach into their breast pockets.
Sometimes it just becomes a competition to see who can pee the highest, and generally women don’t want to get involved in that.
Why is this question always asked? Yeesh. Sociological, economic, political and biological reasons.