I have begun to build an adult directory that is optimised for seo (not just of the directory but of your links). You can add as many of your sites as you like, link back is optional however your placement in the directory does depend on linkback - ie linkers go at top of listing. Graphic design is still in flux but I am going for black n red - probably adding some sort of banner graphics and on the right hand column there will be category sensitive ads.
The script used is a heavily modified script that builds static HTML pages.
http://porn.satanspages.com
Categories include blogs, cams, picture porn, movies, adult services, goods and gambling and there is a facility to suggest new subcats and cats on site.
Remember if you have categorised pages (ebony, asian etc) then you can post links to those internal pages on the relevant categopries and a link to your index in the general category. I am not limiting this to a single post per site though you only need one recip back to be a link partner from a site.
All links are moderated and I will do my best to review them within 24 hours. Please dont post links to paysites with your referral code on as they wont go in! If you own a paysite then by all means post it!