I didn't find anything about this when I searched, so pardon me if it's already answered....
The "Ratings Definitions" page linked when adding in a new story isn't... there. It gives a blank page when I click on the link.
The URL given is:
http://resource.adult-fanfiction.org/story.php?no=600090108
Anyway, can someone provide a definition of the differences between Adult, Adult+, and Adult++?