There's been a recent surge in "protecting children online" stuff going on, the UK being the most far reaching, but Visa and Mastercard have been getting into the act telling online game stores they don't want their services used to buy questionable games. Focusing on adult games right now, but we know how slippery slopes work.
Said it before, I'll say it again, porn is bad for the mind, body and soul, especially for kids, but government rules are not the answer to the issue, and lead to other problems. Plus in modern times, there's a million workarounds, unless someone goes full Great Firewall of China, then there are still workarounds, but the consequences when you get caught slow down the traffic.