This is something I've been wondering for a while after observing a coworker make some "not so smart" decisions in his personal life. I think most everyone here can agree that cheating on someone you're with is a bad thing. But what about the third person that gets involved? Is it wrong to be the person a taken person is cheating with? For example, let's say Doug has a wife, Jenny. Jenny then meets Tim at work, and they have an affair. Jenny, in my opinion, did a bad thing. But what about Tim? Is Tim obligated to not allow Jenny to cheat on Doug? Is he perhaps bound by the Guy Code to keep his hands off another guy's girl? What if the situation were reversed, and Doug cheated on his wife with another girl; is that third girl at any fault?