If written from the punters point of view, I can't imagine it would sell, because we're the least interesting part of the equation.
For a start, we're all motivated by exactly the same thing; we want enjoyable, no-strings-attached sex with attractive women. Well, who wouldn't? Not much of a story there. The women we see, though, are motivated by all sorts of different and more interesting things.
Not only that, anybody could do what we do. Even blokes who choose not to punt know they could, if they wanted. I suspect that not many women could be an SP, though; it must take a very special attitude and mindset to do the job, especially to do it well. I would think that many women would be fascinated by those who do.
So I'd write it from a woman's point of view, possibly the madame of a long established knocking shop who'd seen it all before, and would have some tales to tell. If any publishers are reading this I have the first 500 words ready to go, I'm available, and I'm cheap.