To even ask, this question is to reinforce the system you decry. This implies that there is some kind of rational limit beyond which men can’t control themselves and therefore we must draw a line somewhere. Then the debate becomes about where do we draw the line. If you really believe the premise that you argue for, then there should be no limit at all. There is no too much. As another commenter pointed out, many African cultures, men and women parade around naked and they don’t have all of the problems that these religious nuts imagine. Accepting that there is a limit shifts responsibility from men onto women. Excuse the pun, but this is a naked power grab. If you truly wanted women to be liberated, you should want complete elimination of these ridiculous rules that place men at an advantage.