Seriously, guide lines used to be a good idea but they can only work when everybody agrees (or there is some written record) of what exactly sexual harrasment is.
And 'unwanted' sexual advances? How the hell can you know if the girl wants to talk to you, without talking to her? Heck if I was a girl who got asked out 50 times a day for coffee it would properly be annoying too -- does that make it harressment?
I mean, sure you treaten somebody that is one thing, but only because we have a pretty good societal standard for what is treatening -- yelling at people is, being black in an elevator is not.