To do or not to do that's the question?

Okay here’s my weird tale, I am friends with a woman who is a bit screwed up in her head, she seems to have commitment problems with men and always rush into affairs without considering the outcome of her actions. And she always tends to get involved with the wrong men and the worst part is she always marries them and divorce them a year latter. We have been friends so long that I can’t even recall when our friendship have started and after every failed relationship she comes to me and cry on my shoulder, well now after hubby no six she haven’t seen anyone for a year now. It’s now a year ago I have been divorced and she wanted us to take our relationship to the next level into the bedroom, I am lonely but I value our friendship more. She tried to convince me that the sex will only be for recreation and no strings attached. It’s very tempting but I don’t know if I should. It does not feel right, yet I think I need a little fun between the sheets but I am scared of the complications. The complications can be that our friendship can end if I decide to end the sex or benefit part.