As I’m sure you’re well aware, there are many good reasons to have sex. In fact, sometimes you don’t need any reason at all—other than, say, loving your partner.

However, sometimes a lady finds herself doing all the right things for all the wrong reasons. That’s what we’re here to cover. So if you find yourself in any of the following situations, please extricate yourself as quickly as possible:

Revenge: The most popular very-wrong reason to have sex, revenge sex never ends well. Hooking up with his best friend because you’re angry at your boyfriend will get you nowhere. If you do manage to break up their friendship, then you’re stuck with an untrustworthy dude (if he did it to him, he’ll do it to you). Even worse, there’s always the (strong) possibility that he went right back and told his buddy and the two of them are now comparing notes over high-fives and hot wings.