I hate to say this and be labelled fart-sexist, but it's WAY unattractive for girls to let one rip. Guys? Yeah, fine - it's usually funny because they know how to make it into an acceptable conversation marker.
Girls tend to make the whole ordeal very awkward, and the only way a boyfriend can...
yeah, he probably likes her and is jealous 'cause he didn't have the guts to take her first, and that you got her instead. Either that, or for some reason he's got the notion you're bad news for her - and he's doing the "protective older brother" role some guys have.
It's much more likely to...