Your response is disturbing. You seem to think that the fact that a man has bought a woman a drink gives him the right to initiate unwanted physical contact. It does not, and I suggest that you avoid any temptation in life to act as though it does. Buying a woman a drink gets the man the right to start a conversation that the woman can terminate at any moment if she so wishes, and nothing more. I note in passing that you can 'purchase' the same right much more cheaply by finding a witty line, or just having the courage to walk up and say hello.