Where does that leave you?
More than just two people in this office. It isn't just about the Babe as being the victim, other people are being done out of opportunity. This is called a Hostile Work Environment. You have just as much a legal cause of action as does the Babe. AAMOF, you could probably sue her, too.
Trouble is, so many guys identify with the Boss. They want to own the candy store someday, so they get the candy they want. But there's a reason the military doesn't allow this sort of fraternization.
No one I have heard of got a “promotion”. Where does one go up from ‘Personal Assistant’? Sure, it may be up from ‘Coffee girl’, but not exactly a glowing reference now is it?