From personal experience, I'd stay the hell away. I'm not just preaching to the chorus here, I've had an EX who had a lot of guy friends and it's bad news. Why?
1. She's most likely ****ed/****ing/will **** at least 1 or 2 of them. Remember, most confident guys don't have friends for women unless they are useful for something (sex obviously).
2. She's not friends with women because they have shunned her due to her slutty activity. Most good women will not associate with a woman who is walking around stealing their men.
3. She's not friends with women because she can't commit to a friendship in which she can't sneak around and lie. When a woman enters a friendship, there is a bond of trust that most women can keep. This woman has some deep dark secrets that she is not willing to share, even with close friends. Her excuses for friends (guys), like I said are usually not good friends. Sure, she may have that gay male friend who is harmless, but if she has multiple guy friends who she frequently talks to and little to no female friends, bad news.
So I repeat - stay away! Even if only 1 of these is true (but I bet 2 - 3 are), that's enough to not start a relationship with this woman. Hell, I wouldn't even keep her as a FB. I can tell you have some sort of feeling for her so it's better for you just to get out. Don't be a sucker and fall into it and "see how it goes." I don't want to see your ass back here in 6 months crying about the guy you found out she was ****ing on the DL.