I fail to see the stupidity of OP. He simply took advantage of a situation, that I think a majority of our younger audience here would take. As for those who are claiming he is stupid, or disgusting. Come on. You're either upset because you're settled down and you are afraid of the thought that it could happen to you, or old enough where you're not concerned with being honest, but being a presence of maturity.
Sorry to be blunt, well, I'm not really, it's how I am when I see a line of bullshit.
He was stupid because he knew better and still went ahead with it and then came here hoping we'd agree with him and make him feel better about the shitty thing that he had done. Whether or not she wanted to do it or was willing to cheat is ultimately unrelated to the discussion. It was up to him to say no and be the bigger person knowing that she had a boyfriend.
If you don't respect another mans relationship, then you don't deserve my respect.
You're ill informed and playing to stereotypes about young men being dirt bag girl users and girls being cock hounds.
The rest of your argument about settling down or fearful of being in that situation is downright stupid all by itself. I've been in those situations, I was in that situation when I was 23 and you know what, I passed on the opportunity to trample on someone else's relationship.
The day you stop using the excuse "well other people have done it" or "you would too" is the day you're mature enough to be called a man.