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Paid members have access to user blogs, instant messaging, forums, live cams, email and magazine articles, whereas trial users can only search the site and participate in some (but not all) of the many chat rooms.
A typical visit to AFF finds most new users overwhelmed by the number of people in their area that are looking for adult fun, but this should be taken with a grain of salt.
As well, I've found a higher-than-average proportion of members that use AFF as a means to gain new "clients" or haven't used the system in years.
I assumed I'd get a swarm of messages when I first joined, as I do on most dating sites with larger user numbers, but I didn't hear a peep from anyone for weeks when first checking it out.
Gold members have the additional features of added storage space, as well as keyword-based searches for members across the entire network.