Sorry, read the question wrong! LoL.
There's nothing wrong with a casual sex partner. But make sure you want to have sex because you want it. If you just want a screwing partner even though you don't see each other going anywhere, that's fine. Just make sure it's something you want and not...
It would probably be easier just to edit Billy outta the song yourself. It's not hard, just download a decent music editor and remove the part you don't want. :)