Here is an example of a sales page that converts like mad...granted it's not porn and fairly genre specific (it's a gaming guide for WOW)
http://www.zygorguides.com/
Look and read and UNDERSTAND what is going on with the sales message here. Granted, porn surfers might have shorter attention spans and won't read an extra long scroll, but something similar can work with adult.
This would be a nice change of pace in adult over the standard tour page/tour page/join page design for tours now. Imagine a porn surfer hitting something similar....it doesn't even look like a typical porn tour, so those who automatically click the back button when they see a standard generic tour...just might be curious and stick around longer and be disarmed.