[true_religion]

In this age, I don’t know why browsers don’t simply have parental controls built in. Nearly all adult sites declare themselves to be adults only in their meta data, and if they don’t they can easily be shortlisted as such.

Heck even blocking the top 100 would pretty much ensure children can’t access the content freely.

[nicce]

If you are in Apple world, there are built in parental controls. "Allowed Web Content"

https://support.apple.com/en-us/HT201304

[kmeisthax]

I remember there being a voluntary rating system for websites back in the 90s. No clue if anyone actually used it, but there was a setting to enable it back in IE6.