I am a female Libran, and I am not promiscous or wild. I enjoy life and being around positive people! I also like having fun but also have a quiet serious side to me! I am single and have never been in a relationship where I cheat on men, would never even think of it. I am quite spiritual so don't believe in being unfaithful. I tend to meet men that tend to cheat on me!
On the otherhand, I have met a few libran men and feel they can be very friendly and chat to a lot of females. There may be some that may go astray too. They can be quite vengeful, don't think they like being hurt or ignored! Librans like to be loved and fall in love, it is harmless to a degree but they sometimes live in fantasy worlds.
I guess there are other star signs that have positives and negatives about them, sometimes it is the individual and not the star sign that is the problem. Perhaps you need to just look at the individual and or try other star signs and see what best works for you!