https://phys.org/news/2018-12-sexual-subcultures-collateral-tumblr-adult.html

Over time, Tumblr has become a haven for fanfiction writers, artists, sex workers, kinksters and independent porn producers who have built subcultural community networks by sharing and discussing their user-generated content.

Tumblr's definition of what constitutes permissible adult content fails to recognise the value of this kind of work. It separates sex from politics, preserves a class-based distinction between art and pornography, and limits representations of female nudity to reproduction and health.