Tumblr is giving us a deadline for utilizing their site/app for adult content until December 17th! Whether that is why you use it or not, this is gonna make a bunch of changes for the app according to the Verge.
"Tumblr explained its decision this morning in clear terms, writing, “Adult content will no longer be allowed here. While we do not judge anyone for their desire to post, engage with, or view this stuff, it is time for us to change our relationship with it.”
Technically, any illustrations that feature sex acts are also banned, while nude illustrations are okay. But a litany of examples gaining steam on Twitter and other forums is highlighting how the underlying software is capable of making serious errors."
This plan came about following Starbuck's lead on it by blocking guests on their wifi who are using it for the same purposes - adult content. So do what you want till then and then find somewhere else to get the material you want if that's what you want!