I used ProAdult.com as well ...
still have an account (I think - it's old - but never cancelled by them) ...
Find me an AVS that says explicity WE ARE AN ADULT VERIFICATION SERVICE ...
I will join that one regardless of the sign up ratios.
Adults have a right to reasonable access to the information age. It is unreasonable that currently it seems there is no way to do that.
Children have a right to reasonable access to the information age - it is unreasonable to show aroused genitals or reproductive fluids on your directly accessed domain name - regardless of the name.