Help! I have a friend and she's in trouble..., She's being pressured. Options

[luminax3]

I'm friends with a really good person. I will not mention her name though, oh and it's not me lol. But yeah. Anyways, she's 16 and she has a really good boyfriend whom I met, and he's the sweetest guy ever to her. He treats her so well and he's such a gentlemen. But they have not had sex yet. But lately people at my school have asked her questions like "Would you ever blow a guy?" or "Would you ever give head?" Usually she'll just say no. That she does not like it. She doesn't find anything gross and knows that it's a very loving feeling for a lot of couples. But she doesn't wanna do it. And her and her bf talked about it and he doesn't like the idea of her putting that in her mouth. He doesn't want her to do it and she doesn't wanna do it so everythings peachy right? Well not really. Because just the other day a guy had insulted her and disrespected her saying "Your really stupid. You know your gonna suck a guy off one day. So stop saying you wont. Your making yourself look stupid and you'll never get a guy to love you." And her friend told him to piss off and stuff but ever since then. She keeps thinking she's not normal or anything. And ALOT of times she would follow her heart and do the things she wants to or whatever she's comfortable with. Her bf got really pissed though and he wanted to beat the guy up. And he told her that its ok. that he'll never do something like that and that everything will be ok cuz its him and her. not him, her and other people. She trusts him so much but sometimes in class she'll think about it too hard and wonder if she's wrong for this. and i dont know what to tell her.

Oh and she's not one of those immature wishy washy girls. She's very mature for her age and she knows what shes doing.

Positive advice please? No "tell her to do it. its normal." kinda crap.
thank you.