Jack ,
Maybe they do within their subjective morality and ethics. However, who ever said paying for sex or selling sex was immoral or degrading. If you really think about it, it was humans who created these silly notions. Aren't dignity and what we are morally comfortable with just a state of mind ?
I think you might have missed the point, Jack. Human psychology is complex and what stimulates us sexually can easily become blurred, especially when you add in the hormone factor.
I'm not going to even pretend to understand the dynamics of this act which many people perceive as sexual, but wouldn't most guys be aroused by a girl who literally gushes warm "pussy juice" ? I think there is some element in the fact that piss flows from within a female and specifically appears to cascade from her pussy. It could be just another way to get "more" of the female in question or possibly an element of her sharing something [forbidden or personal] of herself. For some, it could be a substitute for a lack of fulfilment in other sexual areas. Of course, for most people there are also the issues of power and consequently submissiveness. It may be some combination of all my previous suppositions and more.
As I mentioned earlier, there are no doubt psychological issues involved. As long as the participants are actually aware to some degree as to what drives these urges and it isn't an obsession, it can't do much harm between rational adults. I actually believe that most of us who obsess and become consumed with sexual desires are trying to compensate for other voids or band-aid underlying issues - I don't think that's any big revelation though.
Now, I think we all could use a little therapy ... heheh ... who's on schedule ? :þ