Each person has a definition, I hope to hear some of them here. Is lust for someone other than your partner cheating? or is it acting on that lust? Are there any exceptions? Better be..... if one partner is the second partner needs to be supportive and not cop an attitude. Are there any acceptable practices...? Swinging, Open relationships, etc.
Sorry if you came here to learn how to cheat, your out of luck. But that fact your reading this on this website your probably in the right place and already in the right mind set. So what do you consider cheating.
Since I started this I will get the ball rolling.
Simple definition To me Cheating is when one partner, lies and seeks out a second partner for any physical gratification.
I am sure that there are many more definitions, lets hear a few...