Given the sentiment expressed in the comments here, I'd be interested to hear what technique others would propose to prevent access to porn by minors.
And then they will regulate themselves.
The way I see it avoiding awkward conversations seems to be the most consistent "real goal" judging by other actions.
I'm quite sure ulterior motives explain more than stated goals, here and elsewhere.
So perhaps there should be good non-prude material for under aged people that are interested in the subject. If kids have nothing useful to watch they'll watch porn instead, right?
For example: I found a very informative book about drugs at school written by two guys that tried about every type of drugs in existence and wrote what to expect from it and what it's benefits and risks were. The section heroin basically contained the word: "NO". I don't think kids in the US had access to this type of information given what happened in the last decade with heroin because of 'protecting the kids' laws in schools.
Once you're competent in the relevant domain you can usually skim through those chainsaw and flamethrower DIY videos, find the parts you need and implement them with little issue.
Edit: and the things you should watch out for is not porn, but have you kid joined some weird religious cult or a gang - that can cause a LOT more trouble than having an awkward conversation about sex.