Guys, what's the difference between "bitches" and good girls?

I know their behavior. But why do you pick them? I see guys picking "bitches" and even catering to them. While others cheat on their nice girlfriends who caters to them.

Excuse the vulgar language, but that's how men refer to them. Just trying to relate.
Guys, what's the difference between "bitches" and good girls?
Post Opinion