Tumblr bans all adult content, such as "female-presenting nipples"

Tumblr, the mainstream web's last redoubt for niche smut in general and queer smut in particular, is going to clean house. The social blogging platform is banning all adult material on December 17.

Banned content includes photos, videos, and GIFs of human genitalia, female-presenting nipples, and any media involving sex acts, including illustrations. The exceptions include nude classical statues and political protests that feature nudity. The new guidelines exclude text, so erotica remains permitted. Illustrations and art that feature nudity are still okay - so long as sex acts aren't depicted - and so are breast-feeding and after birth photos.
"Users have a chance to appeal flagged content"

The policy change takes effect on December 17th. From then on, any explicit posts will be flagged and deleted by algorithms. For now, Tumblr is emailing users who have posted adult content flagged by algorithms and notifying that their content will soon be hidden from view. Posts with porn content will be set to private, which will prevent them from being reblogged or shared elsewhere in the Tumblr community.

Even the cold dead embrace of a Yahoo! acquision could not end Tumblr, such was the power of fandom gathered there. But Yahoo never knew what it owned in Tumblr and was indifferent to its continued existence. The management of new Yahoo owner Verizon, however, has a pulse. It knows what Tumblr is and it hates it. It will hack it down until a perfectly clean advertising- and appstore-friendly traffic center remains.

That phrase Tumblr uses, "female-presenting nipples", is rather on the nose. Almost darkly comic, even, given the context of its young female audience. Weirdly fitted to the reactionary charicature of Tumblr users.

I wonder, though, if it exposes a specific hidden rule that Apple would not publicly disclose in Appstore guidelines that speak only abstractly against pornographic material, but which it has told Verizon is a specific criterion.