Nothing new, but I figured you guys might get a laugh out of this. Or the opposite.

I was with a group of my friends at a bar and my roommate "R" said his friend was coming into town with his girlfriend next weekend.

R: Yeah his girlfriend tried to have sex with me while he was sleeping in the same house.

deepfriedcocaine: Did you?

R: No, he's my friend's girlfriend.

deepfriedcocaine: So? You could ask first.

R: Dude I can't fuck my friend's girlfriend.

I had to keep in mind that my roommate is currently in a something year long relationship.

deepfriedcocaine: Did you at least tell him that she tried?

R: No.

deepfriedcocaine: Well if she's the kind of girl that would cheat, you might as well do it instead of leaving your friend oblivious, with a slut. She's probably sleeping with numerous other guys.

R: Gee, deepfriedcocaine, I really hadn't thought of it that way. And yeah, she is.

deepfriedcocaine: Does he know?

R: No.

One of the girls "G" at our table overheard our conversation and enlightened us with her feminine perspective.

G: I think that it'd be wrong for you to sleep with your friend's girlfriend, it's like just because I slap someone doesn't mean they could slap me back.

The slapping argument didn't dignify a response.

deepfriedcocaine: Why? She's the one in the relationship.

G: But he's your friend. Would you have sex with your friend's girlfriend?

I turned to R.

deepfriedcocaine: If I ever agree to be "exclusive" with a girl and she hits on you, then by all means, fuck her and let me know. That would be the best thing you could do for me as a friend.

G: But she's your girlfriend!

deepfriedcocaine: Not if she's hitting on other dudes.

My friend "X" entered the conversation.

X: Yeah, you might as well treat hitting on other guys like cheating. Trying to cheat is basically the same thing because of her sexual intentions.

deepfriedcocaine: Yeah and meanwhile this kid is remaining exclusive while his girlfriend is getting nailed by the entire city.

G: He's being a good boyfriend!

Upon exceeding a hamster's emotional threshold, all forms of logic will be abandoned, suppressing dissonance into an infinitely dense point, only to implode upon itself and move on—in a new direction.

Hopefully R will tell this guy.

deepfriedcocaine: He's being a pushover if he doesn't know and a pussy if he does.

G: Ew, I don't like that word.

deepfriedcocaine: Pushover?

G: The other one.

Probably because she has one and it's the worst insult out of dick, asshole, and pussy. And having balls is a compliment. But I digress.

TL;DR My roommate's friend's girlfriend is a cheating whore. A girl that heard about it said that he was being "a good boyfriend" for remaining exclusive while she rides the CC.

Edit: As expected, there are a lot of differing viewpoints here, which is why I posted it. Just because this is how my logic works out doesn't mean that it'll apply to everyone (and I don't want to inadvertently betray my friends). Although I wouldn't fuck my friend's girlfriend without asking first, there's no reason not to tell him that she was hitting on me. But if a girlfriend of mine had cheating intentions, I might as well let my friend get the most out of her.