She's got us all standing on our heads except me :S?

so me and my friends have been talking to this girl for about 6 months now because i was in a relationship with her friend which recently broke up. but for some reason about 7 of my friends like her (not my ex) and are acting like their in competition with eachother for her. but i cant work out why to me and one of my other friends she's nice like a normal girl but thats about it she's not really attractive or flirty or talkative, just a normal girl and its also well known that she is a bit of a slag in all fairness as she went camping with two boys and had with both of them (they were also brothers). but why are all my friends going for her it seems weird in a way and its making everyone fall out even though she has a boyfriend.