Tumblr will ban all “adult content” from their platform beginning on December 17th:
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 breastfeeding and after-birth photos.