Personally, I have never been into porn. So I can't address your concern directly. I have, however, struggled with "fetishistic" types of behaviors in the past. My experience has been that when my outward situation changed, such that there was no longer an opportunity to engage in the behavior, then the behavior dropped away. In fact, it didn't even cause me that much distress. However, prior to my outward circumstances changing, I don't believe I could have abandoned the behavior simply through the use of willpower. Beyond that, I would say that therapy may be your best bet.