Attractive girls, how do you separate the good guys from the bad guys?

This question is for all the girls who are attractive enough to where guys approach you with the intent for sex / where men go out of their way to be nice to you even if they normally aren't. How do you find out who genuinely is a good guy?

I have some idea's on how I'd approach it, but I can imagine it can be come really difficult to tell especially at first and I have no idea what the ratio of bad guys approaching you versus good guys approaching you is.

So how do you prevent yourself from getting used?

Attractive girls, how do you separate the good guys from the bad guys?
Post Opinion