Have you ever wondered why so many women go to some very considerable trouble and probably endure some real discomfort in skin tight jeans if not to show off their backsides? If no man took any notice the fashion would die out in a year. I have yet to have any derogatory retort from politely and humorously complimenting a woman on her figure. I fear some women will use this law, should it pass, to humiliate or damage a man for what was a complement.
I just asked my wife if such a remark made to her in good humour by a stranger would offend. She replied it would not and mumbled something about "if only".