Touching someone in a very personal way, at a professional conference, during the professional conference? Obviously we can only ever speak for our personal op

Touching someone in a very personal way, at a professional conference, during the professional conference? Obviously we can only ever speak for our personal opinions, but at a professional conference, during the working hours of that conference, I want professional behaviour. I'm there to hear and talk about my profession; some dickhead who sees it as an opportunity to cheat on his wife feeling me up? I take a dim view. Even some tosser trying his luck with a "cheeky" remark (and those tossers always know just how to pitch it for plausible deniability - I know when I've heard someone being out of line, but they act so hurt and so innocent when you bring it up) ruins the mood, and not just for the target.