Have you read Boys & Sex? It is a lot about this. Very insightful and sad and...just so, so good.

I have found this to be so true. I can remember times where I literally had to MOVE MY BODY away with my hands over my chest trying to get a guy to back up and stop coming on to me. And the few times I had enough courage to say, "Please, stop. I'm not comfortable with this," they all reacted by laughing and saying, "You think I was hitting on you? What an arrogant bitch!"