More simple (because not on a case-by-case basis): put a blanket ban on porn online, and create rooms where you can watch porn (like in Japan: ビデオボックス), and the

More simple (because not on a case-by-case basis): put a blanket ban on porn online, and create rooms where you can watch porn (like in Japan: ビデオボックス), and these rooms should verify identity and age. This will also prevent people from watching porn at work, while strolling at the park, in the queue at the supermarket or while driving a Tesla. Basically a cleaner society.