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Italy will be the latest country to require age verification for porn sites
(www.engadget.com)
This is a most excellent place for technology news and articles.
At least in the EU they will implement a verification system, meaning you only have to verify with the official government, and then you can use a anonymised token that gives the porn sites only the age.
It's not perfect, but it's far better than everything else suggested.
the recent California law seems to be better. what it requires is the parent to be able to configure the age for an OS account. browsers can then check the age bracket, and enforce the limit instead of having the website do it.