There is a Washington Post article released a few days ago. Tumblr is changing its TOS and well as AO3 and deviantArt ... there may be more than these but .... not sure how many of you visit those sites or use them.
You'll have to google the article, its been a real pain to come up with the simple link to the story.
Basically:WP Article by Eli Rosenberg, dated 12/3/18
Tumblr announced Monday that it will ban nearly all nudity from its platform, ending one of social media’s last major refuges for explicit sexual images.
There is more to the story but I don't want to get that deep into this topic. Read the article and you'll know what you need to know.
I will say, there are creators, authors and artists who post items and some are commissioned that would be deemed risque.
More of a heads up. TBH - not sure what policy changes are going on with AO3 and deviantArt .... I saw them mentioned on tumblr, it could be nada. I only know that tumblr is addressing the issue. Sometimes these things have a domino effect.