@dansup ‪@philsherry‬ Tumblr allows nudity behind Community Labels to satisfy the hidden by default requirement. https://help.tumblr.com/hc/en-us/articles/5436241401239-Community-Labels

However, 1.1.4 is one reason why you see basically no porn apps on the App Store:

“Apps should not include content that is offensive…Examples of such content include:

Overtly sexual or pornographic material, defined as "explicit descriptions or displays of sexual organs or activities intended to stimulate erotic rather than aesthetic or emotional feelings."”