Exactly Frank, it is to prevent such men 'getting into' these classes that women have the CHOICE to enter women only classes.
I must add that I would argue as fiercely for men only classes as I would for women only classes where there is an obvious need for either one or the other.
By the way, there was no hue and cry when 'Man in the Kitchen' classes were provided at our local evening class venue a couple of years ago even tho' they occupied a slot that could have been used by a mixed class.
That's it, no more, from me on this subject!