I think many women are more comfortable in a women only setting and they are likely to buy women's only classes which is why their is women's only classes.
I have helped teach hand to hand classes that had women in them, women retain info better then men and remember more detail much of time. Most of the new women would lack enough aggressiveness(a lot men also). Women would get into all women groups and it would be a pat, touch, lets discuss this and that, which does no one a favor in self defense.
My strategy was to escalate their aggressiveness in a mild progressive manor until they feel comfortable beating someone to the ground
