Ever think about cheating?

Are you in a relationship and think about cheating? I have a bit of a kink for it now, not actually cheating on my S/O but being with another woman that thinks I'm cheating on my S/O with her.

I can't really say that I would ever think about cheating. I'm really possessive, so if I have a boyfriend that I really love (I'm gay), I wouldn't do anything to screw that up.
I never understood the idea of an open relationship either.