Hi CT,
I assume this isn't meant to be a feeder site (I'm not really familiar with ProAdult) and is meant to make sales? If so, I would work on the sales pitch a lot more. Give the surfer a reason to want to join. Build up a fantasy to increase the surfer's interest, also talk up ProAdult. Let the surfer know that "when" they become a member they'll get everything else ProAdult offers.
SE work is another thing you may want to look into. If you add some good, keyword rich, fantasy building text to your tour it will probably go a good ways toward helping with SE optimization, as well as sales
Just some things to think about...
Regards,
SF