I too have been sucked in to using my credit card for age verification, on a porn site.
I did not even get to see what I wanted, and got charged for it 4 times, a total now of $243.72 aust.
I have cancelled the subscription on p.zest.com (aka)datesnow Pty Ltd Brisbane as recomended but have recieved another bill on this months credit card. I have also tried to call 1800 447 6439 but the service is out of order.
Please tell me how do you stop this going on.