I have always loved it and fortunately my wife enjoys inflicting it on me. I think for me its strongly linked to my penis size, and its how I've used it as a coping mechanism and a sexual outlet. I think if you lack in something as a person you need to make up for in other areas, so the humiliation aspect offers my wife and offered my ex's a level of amusement that kept them sexually interested in me. A bit like the nerdy kid at school that wasn't great at anything but made people laugh, I think that was my role, and if my cock even got a laugh... at least it was something to work with.
Once those laughs and my orgasms were linked together, they became more intense and it was a high i've been addicted to for the last 35 years.