I never thought I would be here

[2overcome]

She has mentioned that her friend is coming back into town in a few weeks (guy) and if its cool if she hangs out with him. I told her to "Knock herself out and have fun". Now I believe this is EA #2 in a period of the past 3 weeks. (The first went sour apparently because the guy didn't want to be a home wrecker.) She then made the comment "So can I sleep with him?" (now mind you she kind of had that joking tone, but there is no telling) I of course gave her a sharp look, you know the one that says "Hell no!". On this notion I am thinking about taking a stand on this one and telling her that as long as we are in the same house and until things are final that isn't going to fly. Any input on how to handle a situation on this?