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If she is just friends with the guys it makes no difference to her whether they are guys or girls (we all know what happens when you become a girls friend)
If she is screwing all of them so what, you could get laid or if you want something more serious then she would blow them off. I think it is mostly a confidence thing, who cares if she is screwing 10 guys that are all better she is still sleeping with you/spending time with you and enjoying herself and in a more relationship context she was single when she was getting with the guys, if she is willing to commit she is usually willing to be monogamous.
Which also leads me onto until she is spoken for she can do whatever and whoever she wants and it should be none of your concern. Its like looking in the other lanes at a swim comp, as long as you win who cares where the others are.
I sort of agree with the above, but not totally, it is your business if you are having unprotected sex with the girl and she is supposedly only having sex with you (something you discuss with her beforehand).