From my studies and empirical evidence, the bad treatment of women who go into prostitution begins at childhood with a POS father or a non existent father. When women grow up, they subconsciously look for a man like their father. So when their POS father was abusive or alcoholic, a gambler or a cheater...they look for guys like that. That is why many child molesters were themselves molested as a child.
Then you get God knows how many guys using their pussy every day for money, calling them whores, cum dumpsters, sluts...and the guys think because they leave an extra tip, that makes the woman feel ok.
I thought I was "role playing" with my East Indian first wife when I was in my 20s and called her "slut", in the middle of sex. She immediately started crying and I never went limp so fast. I had a gf in high school that was being a bitch during sex and wanted to do me in the ass with her mom's dildo. So when we were done having sex, before I left, I put some cash on the nightstand, as a joke. She never got so offended by anytime else I ever did.
So these johns do nothing but treat these women like whores and think they are heros for that extra $20 or $50! Maybe that's why I can't go into the vagina of a woman with whom I'm not in a commited relationship.
Sorry to throw a wet blanket on all the FS "hobbyists". Ironically even they know it's wrong by calling adultery/fornication/prostitution, "hobbying" to make it sound better.