I do want to help ensure that under-18s do not come to the Cellar. However I am equally sure that the new regulations will make it more difficult for some of our legitimate members.
Firstly, we will not be in a hurry to introduce the restriction on entering the Cellar. Secondly I dont think we are a "public place promoting sexual activity" we are a club open to the public promoting quality D/s relationships that may or may not involve sexual aspects.
If you have used payment information (essentially a credit card) with the Lindens there should be no difference for you. If you dont, then you should be able to verify your age using the Linden system. Apparently this is completely seperate from SL and SL only recieve a code indicating a successful verification. However I have not yet tried this system.
The recent linden post on search and adult ratings is here: https://blogs.secondlife.com/community/technology/blog/2009/06/10/search-and-adult-content
A summary is here: https://blogs.secondlife.com/community/features/blog/2009/06/01/adult-content-changes-in-summary
Their FAQ on it is: https://support.secondlife.com/ics/support/default.asp?deptID=4417&task=knowledge&questionID=6032
If you want to test whether you are adult verified try going to:
Linden Account Verification Test, Oatmeal 15 (249, 242, 22)
If you are worried or want to discuss this do contact me in world.