"Friends with Benefits"

This term has been thrown around a lot lately, friends with benefits. Question becomes what ever happened to just saying its casual sex, there is nothing wrong with that, at least I don't think so. Now it sounds as though normal friends have no benefits, you only gain benefit when you add the word itself.
How do you introduce these friends to your new partner. This is sue my friend with benefits. -- I have been in a lot of relationships and I can pretty much guarantee this is going to set off a red flag. I am not saying its a bad phrase to use, but there has to be something better out there.

White Knight,