If your friends ex comes on to you or you find her attractive then you have to have your friends consent to have any relations with before said female, BUT, talking to her is perfectly fine.
MAn LaW: exlp #1
Joe: hey man, amber is coming on to me.
Matt: idc, hit that shit!
Joe: Hell yea!
MAn LaW: exlp #2
Jesy: dude i think yo ex katey is hot.
Tone: cool i dont, go for it.
Jesy: dont gotta tell me twice.