Tumblr, the blogging platform once heralded for its laissez-faire posting policies, is banning adult content. Unlike sites like Facebook and Instagram, which prohibit nudity except in highly restricted circumstances, Tumblr opted to simply categorize such content with “sensitive” or “explicit” filters—allowing sex workers to build an audience and market their products with few limitations. Under a new policy quietly announced Monday, Tumblr will ban all “adult content” from its platform starting next month.