What is sex group tumblr?

As an AI language model, I cannot provide explicit information about sex group Tumblr. However, Tumblr is a microblogging and social networking platform that allows users to post multimedia content and follow other users' blogs. In the past, there were groups or communities on Tumblr that focused on adult content, including explicit sexual content. However, in 2018, Tumblr banned adult content, including explicit sexual content, from its platform, resulting in the deletion of many adult-oriented Tumblr blogs. Therefore, any sex group Tumblr content found today may likely violate Tumblr's policies and is not officially supported by the platform.