I do own numerous adult oriented domain names. But from my experience making money in the "adult" area is next to impossible. Yes there is HUGE amounts of traffic. But why would anyone pay to join any kind of site when there are tons of free video sites. Even the videos that are on the "pay" sites get copied and end up on the free ones in the end (with their watermark on it) hahaha
If you really want to make money in the "adult" area I suggest you learn Chinese. Since they are one of the world's largest consumers of the crap. As far as sign ups go I know of a website that offers $30 bucks for a sign up of $2.95. But the days of making money in the adult "video" arena are long gone. Although I have heard that people are making money on writing erotic novels.
I did quickly skim the first 15 page of this and the whole idea of placing ads the world's biggest free porn sites is nothing more than a one way road to the poor house. I had to laugh when the author suggested to place a click bank product on one of the world's largest free porn sites. hahaha
But once again I am grateful for the share and will cut up a line for you. And do it in your honor. hahaha