I personlly never affiliated with adult sits, but no people who have, and its professional.
However, a lot of the click throughs and such are not targeted at all, well they are tareted but not payable.
Meaning if you are running PPC ads, alot of your clicks are going to be from 12 to 16 year olds (sorry guys), trying to have a little alone time.
They aren't going to buy anything.
You really have to build a list like everything in this market, that is what my friend did and it worked out great for him
one big idea in development