Having bounced at a "bikini bar" I can tell you that atleast for the dancers, most are college girls strapped for cash and they are lacking somewhat in the morals dept. As far as the porn stars go, my belief is that they are introduced by a boyfriend, FATHER or someone close after years of being told they are no good at something.
Even though I hate Howard Stern, I agree with his belief that whores, ummmm, I mean, PORN STARS were all sexually abused as kids. It just sets sex off as being extremely dirty and that they should be used by men in order for them to feel good about themselves.
My question to you is, Why do you care? (No offense intended.)