Dude I thought you liked the "thicker" chicks? Anyways, not trying to be a dick but like someone else said on here, its not how fine your girl is, your "brahs" have no fucking respect for you. I fucking erase people like that out of my life.
I had one "friend" stay the night after a BBQ cause he was drunk and he totally tried to fuck my wife. Walked right up behind her and reached around and grabbed her tits. I was cleaning up outside when I hear screaming and shit breaking and run inside. It was my wife beating his ass on the floor and throwing glasses and plates at him. After I got her under control I "escorted" him outside and smacked him around a little then gave him his keys to his car. He tried to apologize and shit the a couple days later but I don't forgive that kind of shit.
There are dudes that flirt with my wife when we are out and she tells them shes married and 99% of the time they respect that shit. To be honest though, most start off with a light flirt and see if the signals are picked up and returned. If more than one of your "friends" are straight up asking to fuck it makes me wonder what kind of signals she is putting out bro.
Though either way, if I were you, I'd walk right up to your "friends" smack them like a bitch (open hand so it leaves a hand print) and confront their ass...earn their respect. If I stepped out of line and a close friend popped me one I would respect him and of course apologize as I know a real friend wouldn't do that unless I REALLY fucked up.