Surely a person as bright as yourself understands the basic physics involved here. When a girl in a short skirt starts dancing, what is likely to happen? Yep, the laws of nature dictate that what is UNDER that skirt is likely to become visible. Would you be willing to extend your "distracting and irresponsible" clause to include anything that is publicly visible?
Yes, but ONLY if such was actually demonstrated by the girl(s) in question. I would give them the benefit of the doubt. As I posted earlier, I've been to many, many dance clubs in my day where many young ladies where wearing very little, and I have yet to see thongs bouncing out from underneath skirts. Can and does it probably happen? I suppose, but I've never seen it. If you have, let me know where you go :-).