Quoting Click Me Click Me!!!:" I dont see what her being a slut has anything to do with this... Anyways if that was the deal tell him to get the F out if he can't pay."
I don't either, or the fact that she sleeps with "Mexicans"
I would set up a type of written agreement, and have him sign it. Tell him that if he breaks the "lease" then he will have 2 weeks or so to find somewhere else to live.