Some time ago, I browsed past a web directory service of erotic service providers all around the world, but I didn't manage to save the URL and never did find it again.  
What was unique was that it was clearly set up for a high degree of discretion for both clients and providers.  You had to pay a fee and provide appropriate information to access the listings, and the Providers were mainly not those who advertise in your local newspapers or in free web sites.  In fact, many of them were not in 'the business' at all, just women who were interested and skilled to do nice things for grownups with money.  It seemed that it was very professionally arranged.  Does this ring a bell to anyone??? I wish I could find it again. I'll be a happy fella if someone can lead me back there.   Thanks, Paul