So you want to pretend that there are not very clear and widely accepted standards available for what constitutes gratuitous violence and pornography?
Widely accepted standards say that trying to turn other people into unpaid babysitters because you don't want to spend time overseeing your 7-year old kid is wrong. Since you obviously don't agree, we can't possibly know how your standards may deviate from those of a normal person in any other subject.
Guess what, there is this industry called movie business and TV.
So, this is now officially about turning Wikipedia into a new-age TV nanny?
I no they are old media and that's why you may never have heard of them. They had the same kind of issues and came up with standards long time ago. Amazing isn't it?
Sorry, but no. The ratings there refer to the presence of sex, and in case of XXX movies explicit sex, not whether the sex was "gratuitous" by some neglicent parent's definition. Furthermore, there's a difference between entertainment and encyclopedia, specifically that entertainment gets to choose its topics and content while an encyclopedia gets them dictated by surrounding reality. Finally, there's a difference of orders of magnitude between the sheer amount of stuff in Wikipedia and media industry's output.
And you still haven't answered the question of just who is going to shift through the archive and new edits and mark them suitable or unsuitable for 7-year olds.