The adults-only door dragon only recognizes current SimsHost subscribers. That is, the list of names he has on his clipboard does not include inactivated accounts or free accounts.

And, of course, you must be older than 17 to get to the adult stuff.

I tested the system to make sure that if you update your user profile, the door dragon's list gets updated immediately. It works. Just don't lie to us about your age, because if you do, we'll tell your mother.

Addendum: If you are under 17 or do not have a current subscription, and attempt to log in to an adults-only area, you get the same response from the system that you would get if you entered an unrecognized login. Our adults-only door dragon can be a real curmudgeon some times.