Sextronix.com and hentaibiz.com has some good hentai sites with tube like tours. You can also set up a hostedtube.com site with only hentai clips (you can choose 3min long previews, full lenght previews or no previews at all) and send traffic to it, demo @
http://www.hentaiultra.com and
http://www.hentai.xxx