Bad Guy or Good Guy

My experience with (many) women has been that they say they want a "good guy", but they go for the "bad guys". I don't want to group all of them into one category, because I've met many girls who really do want a good guy, but sometimes you can't really tell what kind of girl they are until you've spent time around them for a while. I have a 14 year old sister who looks like she's 16 or 17, so recently she's had many "suitors", many whom she's been interested in. Now from what I've perceived, she doesn't like the guys that I would consider the "good guys". She would argue with this, saying that so and so is a nice person, but she sees him from a female's perspective, and not from a male's perspective (my perspective in this case), so she does not see him the same way that I might. Maybe I think so differently because I don't consider myself a "bad guy". I'm not bragging when I say this because (believe me) I am far from perfect, but I've always tried to be myself instead of trying to be someone different for a girl I'm attracted to, and in many cases this results in me not ending up with her.