Tumblr will ban adult content Dec 17th →

https://www.theverge.com/2018/12/3/18123752/tumblr-adult-content-porn-ban-date-explicit-changes-why-safe-mode

Banned content includes photos, videos, and GIFs of human genitalia, female-presenting nipples, and any media involving sex acts, including illustrations.

Might as well have just shut the site down.