As it is heavily implied in my last post and the posts thereafter, his prostitutes are actually treated well by him. Francine, the one he'd found dead at the beginning from a forced overdose, was a very good friend of his and I think there was a bit of something more with their relationship. She was completely chem-free as stated in Redding's intro post and she chose to stick around with Redding because most of the clientele Redding let her go with were very high-paying and clean looking locals and tourists. Redding doesn't kidnap girls or force them into anything, he's done some fucked up shit for cash but a man like him has his morals, for the most part.