Assuming that is true Rip, there is an actual legal term called "Normal Woman" or something like that, used in harrassment cases. The courts have actually recognized that a normal female will react differently than a male in certain circumstances (one of you lawyer types might want to clarify my meager memory). One can only assume that some womens only clubs are necessarily segregated for the same reason.
Just a guess, cause I don't think this actually happens.