Teenage daughter being gossiped about by friends mum

[Carrro]

My daughter is 15 and very responsible and mature for her age. Her best friend has had more than ten boyfriends in a short time, while my daughter has none. My daughter thinks there is something sad and disturbing in the way her friend flits from bfr to bfr. Because of this, my daughter has withdrawn slightly from her friend, and hooked up with other girls, who share her view about having loads of bfrs. The mother of the girl with many bfrs, has now started a whispering campaign about my daughter "being jealous" of her daughter, hinting that if my daughter can not "be happy" for her daughter, she is no friend at all. Considering that we have treated this girl as a member of our family, paid for holidays for her etc, I find her attitude extremely hurtful.
The mother is a single parent who does seem to live her life through her daughter, but still...
I have now told my daughter that I do not want her to have any contact with the girls mother, though I'm quite happy for her to be friends with the daughter.
Am I being unreasonable?

I have taken a look at myself and I just know that I couldn't have done anything to stop the pair in the bushes. They told me quite clearly to eff off and that they would accuse me of being a peeping tom if I intervened. Kids who behave and speak in such a manner deserve to be called slags and worse. I don't feel the slightest shame for "verbally abusing" these little angels. As for not getting involved, it's the parents job to see to it that their kids know how to behave at a party. And that starts much, much earlier than when they are teeangers.

blimey, so do I

has the OP namechanged throughout the course of this thread?

OK, they are both vile little creatures, will that do? I didn't call the police but went inside and told the adults who were responsible for this party. They did not want to "spoil the party" and said they would speak with the kids afterwards. If being disgusted by what I saw, means that I have a misogynist view of girls sexuality, then so be it.

For god's sake, are you one of those "All men are rapists"?
It was bloody obvious, by the sounds, the position, and so on, that the girl was absolutely enjoying herself. Asking if she needed help at that point would no doubt have led to me being accused of being a big fat perv.

I was just going to say that I didn't mean to get into this discussion, just replying to the previous "teenage daughter being gossiped about". I apologize to Carro if ppl think that she and I are the same person.