He doesn't have a fetish and his sex life is normal
That's the irony of all of it. Is this film series made for sexual neophytes? I thought America was sexually liberated, I guess not. Take the red room of pain for example, do you have a pair of fuzzy handcuffs? The only difference between you and him is he has a lot more money and better taste. There is not a sexual difference.
What's the difference between him and real sexual deviance? One is a fantasy and the other is a crime, one causes pleasure and the other real pain. The conceit of the writer and film maker is that his actions are somehow deviant or dangerous and our interest prurient. But all this film shows is a genius for marketing, not any insight into creative sexuality.