I know a guy, hes a brother of my best friend.

A good gauge of manipulativity (is that a word?) is how many women he has been with. This particular guy is about 24 and I shit you not, has fucked at least 65 women. I have known him since we were in diapers and do not doubt this figure. You know its bad when your friends get together and help you count how many people you've been with.