First a question: If it is something you can control, why would you act on it and indulge it? (Seriously. It is a question, not meant to be a suggestion.)

Honestly, I have a hard time wrapping my mind around fetishes, and this fetish in particular. But I feel like I can put myself in a parent's shoes if I were to find out that my child was in to Nazi films. First I would be worried that they were becoming some sort of skinhead or neo-Nazi. That they were filled with rage and hate. That they felt that harming and torturing others is okay. I might wonder if my child did things like torture animals or small children. I might worry my child has a very serious psychiatric disorder.

Now, as far as I know, none of these things are true for you. However, I say them by way of showing you that what your mom is thinking may be even worse than reality. It is unlikely to be beneficial to go into deep details, but it might be reassuring on some level for her to know it is "just" a sexual thing.

EJ