This place looks pretty interesting, as she offers tantric and erotic massage and classes to both men and women. I'm not so sure she explicitly gives "happy endings", but I have no doubt people end up aroused.

I live in Vegas. Not sure how much money you want to spend, but there are happy ending massage places everywhere - and all the fully-nude strip clubs are fronts for full-on prostitution (not that that's what you're asking for/looking for, just saying you can find/get anything you want here, the more you spend, the better it is, and this city caters to anyone with money). Usually the massage places are in small, non-descript strip malls, and advertise in the local rags (City Life is the big one, you'll find it everywhere).