https://www.techdirt.com/articles/20210106/15184046008/content-moderation-case-study-dealing-with-controversial-sexual-fan-fiction-may-2007.shtml

Summary: Sexual content can be challenging for content moderation on a number of different levels -- especially when it involves fictional content about taboo, controversial, or even illegal activities. Literary fiction around these topics has been controversial throughout history, including books like Vladimir Nabokov’s Lolita, which focuses on a story told (somewhat unreliably) by a middle-aged male English professor who becomes obsessed with a 12 year-old girl.

But while there have been widespread public debates about whether or not such written works have artistic merit or are obscene, the debate becomes different when such content is hosted on social media platforms, and raises questions about whether or not it complies with terms of service.