I happened to come across this "Obscenity and Nudity" article in Tiger Magazine No. 3 from 1966. Yes, some people DO read the articles!
It points to the Puritanical attitude of "militant civic, religious, and fraternal organizations" towards nudity in the U.S. compared with acceptance in other ("backward"!) countries like Spain. With nudes banned from ecommerce sites, Instagram etc. we seem to be moving backwards in time (even while porn is ubiquitous).
Here's the banned painting in question.
Here's a photo I just posted to Instagram.
Within a couple minutes it was deleted with the following message:
Our guidelines on nudity We don't allow people to share nudity. We define nudity as things like: •Showing buttocks or the anus •Showing someone's genitals •Showing female nipples, except to talk about breast feeding, the moments after giving birth, health or an act of protest
So nearly 60 years after the Tiger article, even Goya's painting of the Naked Maja would be banned by Instagram. Please note that showing your dick or ass is apparently not an act of protest. Fucking pathetic.