<human>: I am a 20-year-old girl who's had very little experience with serious relationships. I have some issues with commitment and I'm just generally not very emotional. This combination, though, has made it possible for me to enjoy plenty of casual sex since I was 16, when I discovered that I really liked hooking up... a lot. Mostly with older men who were in college or even older. One thing that bothered me is that they often had girlfriends, especially the ones that I had on-going sexual relationships with for months on end.

The fact that they were someone's boyfriend is not what bothered me -- it's the fact that it DIDNT bother me. In fact, I get some sort of satisfaction when I get the opportunity to seduce a man who I know is taken, and succeed. Even more so when I keep them coming back for more. I have no idea why this is and I kinda wanna understand what the hell is wrong with me. I also want to understand why men choose ME to be their side chick. I'm not wondering why they're not dumping their girlfriend for me, I'm wondering why I am the girl they choose to betray their girlfriends with. Is it because I'm available, easy sex, or because I'm good (according to them), or something else? I just wanted opinions on why this might be... Thanks.

Condense the text into a few key points
<bot>: guys often choose me to cheat on their girlfriends with, and I don't really mind. I want to understand why both happen.