They usually say that embracing is best, but I do see how you'd find that level of obsession tiring. Probably "very wrong" does not capture it, but "too much" or "too intense" does?

There is a general approach called desensitization, where you engage in what you want to stop as much as possible, until - hopefully - you become desensitized. I do not know if that would work for you, because you already have rewound the same episode 100 times, but, when you did, you thought it was wrong. How about you do another 100 rewinds, but not thinking that it is wrong?

Also, you do not mention books. What happens when you read a book rather than watch a show? Do you take pleasure in imagining a spanking scene? more pleasure/less/same as with TV or movies?

"Uncle Tom's cabin" and Maxim Gorky's "Childhood" would be classic examples of scenes in which minors are spanked.