Some women don't like the idea of having a penis in their mouth. They feel uncomfortable about it because they think it is dirty or subservient. But it could also be that your friend is going about it all wrong. First he has to make sure he is clean and smells good (no one wants to put a dirty smelly pecker in their mouth!). Next he should try foreplay with her, maybe if he eats her out then she'll be more willing to try with him. They should learn to communicate and tell eachother what they like. A nice way to explore each others body is by taking a shower together. Tell him not to pressure her but learn to understand what she likes and wants.
what your freinds girlfreind decides to do is HER buisness
if hes telling other people shes not sucking him off, he probably doesnt respect her and just wants sex from her. a lot of girls dont like giving head or dont want to rush into it. again its HER decision when shes ready (if ever) to do it
She doesn't want to?
I've noticed a lot of double standards when it comes to oral, guys almost expect girls to give head but most girls i know dont in the slightest expect a guy to go down. Quite aggitating actually =/
if the girl doesn't wanna do it,she doesn't wanna do it.you can't force people to rush into sexual activities.it's gotta go naturally.