I'm going to call my friends bf sexist and tell him that he's not invited to hang out with us
Why would you do that? Is he actually sexist?
Yes, his sexist behavior really pisses me off. These days he's been unable to keep his eyes of my tits and I don't like it.
Oh wow, that's extremely rude of him. He's not taking yours or his girlfriend's feeling into consideration. It's totally reasonable for you to want to confront him about it and not hanging out with him is a good way to avoid the situation.
But I bet if I contact a sexual harassment office I might get a whole paycheck.
It's fine to leave him behind if you don't want to hang out with people who treat you that way. I'm not sure how you're going to get a paycheck out of this, but I do hope that you don't have to deal with his harassment any more after you've spoken with him.