Sadly yes, but it takes alot for me to do it.
I was in a relationship that I thought wasn't going anywhere, and I almost commited whatever act that would have been committed with a girl that would have done whatever with me.
Eventually though, the relationship headed up the road and I realized that I would have made a really stupid mistake, so luckily it never happened.
The reason why I would have cheated was because I was miserable in that "relationship" because it was one of the worst I had been having. It was the typical, I asked her out, and then we would just say we were going out, without having any bond at all. Then there was a dance that we went to together and things turned around, but thats a different story...
I honestly never saw cheating as that bad an atrocity as what many of you make it out to be. It's purely lust, which should be controlled TBH, that has nothing to do with your feelings for the significant other. That doesnt mean I dont frown upon people who do it, but its not as big a commotion as everyone makes it out to be.