Age verification on mainstream porn sites does absolutely zilch against teenagers accessing porn. There are countless other ways of obtaining porn. Even DDG with the safety off will provide plenty of it.

>it might prevent that

On the global internet... good luck with that.

Oh, they'll ban us from looking at other countries net's soon enough for our safety.

>and this seems like it might prevent that

sorry but we're on the internet. You can type the literal words 'hardcore pornography' into any search engine of your choice and find about fifteen million bootleg porn sites hosted on some micro-nation that don't care about your age verification.

In fact ironically, this will almost certainly drive people to websites that host anything.

What evidence led you to believe this, when controlling for heritability?