I struggled with the orgasmic / relief effects of hot water for years; I stay struggle because it was so plainly harming my skin, and yet I got to the point where I couldn't stop myself. It helped to move to a place without a shower, although I still ran hot water over my skin sometimes in more awkward ways. I have come to think of it as an addiction / compulsion. Even a brief accidental exposure to hot water makes it clear that the phenomenon is still alive in me, and I'm quite severe with myself about stopping it. I'm an ex-smoker, and that sort of exposure these days feels the same as a whiff of someone else's cigarette smoke. I recognize it and remember it, but know that it must not be a part of my life.