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Pornhub Sues Texas Over Age Verification Law
(www.vice.com)
This is a most excellent place for technology news and articles.
At what age? 6? Sure.
16? 13? Less likely that it's "in their best interest", because they're now dealing with those physical and psychological changes that are very much in line with the content of porn.
Just like TV, movies, video games, books, and other forms of fantasy / entertainment, parents need to be involved, have earnest communication with, and provide education for, their kids about the porn they will be consuming.
But "porn is icky", so they won't.