The distinction between "art" and "pornography" is also somewhat artificial. It's hard to argue that [3] was not meant to be prurient when the model (underage, by today's standards) shortly thereafter became a mistress of the King of France, based on him having seen the painting. And some stuff that was painted might get you banned from OnlyFans even today, e.g. [4].
But the problem, it seems to me, is that the internet has turned into a place where (1) everything has to be "safe for children" and (2) said safety standards are defined (through US influence, I strongly suspect) to be highly permissive of violence, but super strict on nudity.
[0] https://artsandculture.google.com/asset/the-war/CwHM2HdTO3l2...
[1] https://www.wikiart.org/en/max-ernst/the-angel-of-the-home-o...
[2] https://www.wikiart.org/en/matthias-grunewald/the-crucifixio...
[3] https://commons.wikimedia.org/wiki/File:François_Boucher_-_B...
[4] https://www.wikiart.org/en/jean-honore-fragonard/girl-with-a...
That's far from what your kid can see just watching a few minutes of news. (And I'm not even talking about this email I received from the kindergarten explaining to all parents that kids of this age aren't supposed to watch Squid Game at home!)
> [3] https://commons.wikimedia.org/wiki/File:François_Boucher_-_B...
> [4] https://www.wikiart.org/en/jean-honore-fragonard/girl-with-a...
What's wrong with those two? These are innocent painting of naked people (also children have no sense of pudency before way after kindergarten so they just can't see the problem with this)