Sex with a guy who already has a girlfriend?

It's not bad as long as:

A ... You don't expect anything from him

B .. He doesn't get caught

Good luck to you. ;-)

I don't know what's worse. What you're doing, or the fact you had to ask if it's bad. Seriously. Think about it.

Are you that dumb? Let me answer that for you... YES

Ur fricken awesome!... I mean... on second thought.. if I were a chick (works both ways) I would be fricken pissed off. Its "Bad" with a capital 'R'... for 'R'eally.

Well if you had a boyfriend that was sleeping with some other girl would you care? think about it...

Yes I definitely agree with Rosa,...letting someone cheat is just wrong,...I'm sure you wouldn't want your man cheating on you,...even if you never knew,...it's still wrong. I say you should stop,...but that's up to you I won't harp you for it :)

Something like this happened to me. Only I didn't know he had a girlfriend, because he said he didn't (3 different times). And we didn't have sex, nothing sexual occurred. I slept in his bed with him a number of times, two of which he was naked. He kissed me twice, and attempted things. However, when I found out. It all stopped. Kind of on both parts, but more on mine. I stopped not only because I felt it was wrong, because it's like taking part in cheating, but I knew he wasn't going to leave her for me. AND I needed a relationship for the sexual acts to even be talked about. If I were you I'd stop. I mean if I were dating a guy and found out he had slept with another guy's girlfriend, KNOWINGLY. I wouldn't be able to trust him. I don't think you want to be untrustworthy or known as a home wrecker. I'd stop now.

You are horrible.

You don't even have to ask, you know it's wrong. But you're not the only one who's ever done it.

It's bad if you already knew that he had a girlfriend and that he was already in a serious relationship. So that would mean that it is your fault and his because he shouldn't be having sex with you in the first place and if you did know before that he has a girlfriend you shouldn't be having sex with him either...Now if you didn't knew then this will be his fault and if I was in that situation I would try to avoid it before the problem gets worst.