my virgin post and reply.
Men go through different stages in life, same as women.
When i was young, i am desperated for sex(I believe most teenage boys are like me,too),I respect my gf, i never force her till we are 23 when we are going to marry than we have sex.
When we start doing it, i just cant stop, it is just like a curse. I just want to meet her and do it, i never betray her, i just want to do it with her and not anyone else even when they are occassion when some ladies approached me for...i just want to do it with her, maybe some will said my gf should dump me, but please girls, listen to us, men, it is our needs. Some can control it, some not.Not all men can have sex with other girls. I cant, only with my gf(safe to be with her).

Men are different from women, maybe we are young, fit and strong. We need to release our strength somewhere.

Now coming to late 30, i am sad to say that i am not as desperate as last time. My wife blame me for having sex with her once a month, thinking that i may have betraying her outside.

When she was young, she dislike it at all even i make her so high. Now, she like a beast.hehehe.wanting more and more while i am so stress with my work. May be also lacks of exercise to maintain my fitness.

Maybe your friend is still young and have not reach the age or urges to like sex, maybe some imagination of sexual fantasy to open her thinking. She feel guilty as what was taught in her religious.

Her bf maybe like me, only want to do it with her but nobody else, he may feel hurt and sad for rejecting him(I said that because you mentioned they are going to marry), girls will think that everytime, my bf(esp army boys) meet me just to have sex, he is not worthy for me, just want sex from me. Most of us are build these way, unless gay.

Sometime, it better to keep your virgin and do it when you get marry. When you try it, you just want to have more and more.