Unfortunately for some of us, the UK has gone the opposite direction. We now have to verify our age (or use a VPN) before accessing certain websites.
https://theconversation.com/porn-websites-now-require-age-ve...
https://theconversation.com/porn-websites-now-require-age-ve...
A private way of doing this is absolutely 100% viable with some cryptography and government support. Apparently nobody gives enough of a fuck to even try.
As for the UK's new 'porn ID' law, people are going to die. People will take their own lives when their porn browsing habits are inevitably leaked. Private companies cannot be trusted to keep their hand out of the cookie jar, they WILL link peoples' histories to their real IDs.
Of all the things we do, it doesn't sound that difficult, to be honest.