Hello HD: Well, I guess whether sex is wrong or not is a matter of individual perspective. Personally I wouldn't say it's either right or wrong. It's simply one element of life. Every living thing reproduces in one way or another (so far as I know.) And sex is one way in which reproduction occurs... plus... in human beings... it gets all intertwined with self-concept & emotions & all of that stuff... which makes it all just that much more complicated. As a result, at least from my perspective, it's not something to be taken lightly. But that doesn't make it wrong.
I don't know what the success rate is with regard to therapy & fetishes such as the one you have. From reading various posts here on PC, written by members who have had these, my impression is that they're very difficult to break & that it largely becomes more a matter of "indulging" in them safely than it is eliminating them. Perhaps other members, who have more experience with this than I, will yet reply to your post & offer some valuable information. I wish you well...