Sponsors like Adult Bouncer?
 

Where you can set up your own paysite using their tools/content?

The term you're looking for is AEN/AVS

For premium sites like AB I use
AdultsAllowed - http://www.adultsallowed.com/wm/index.php/3990
Or you could go with deluxepass.

Or if you're looking for the old style AVS,
Cyberage - http://aux.avsofchoice.com/new_wm?refwm=6912933
or
Universal Pass - http://www.universalpass.com/cgi-bin...join.cgi?14998

try deluxepass.com