One of the very first things people did when the Internet got popular was share pornography. Pictures took fucking forever to load on the early connections, so erotic stories were really popular. Some things never go out of style, though, and dirty stories are as hot now as they were then. ASSTR.org, the Alt Sex Stories Text Repository, has been serving up the literary goods for decades now.
The domain was registered back in 1998, but was preceded by the newsgroup where it got the name. This is something that has been growing a long-ass time and is still sprouting new pubes. Though overshadowed by new shit like free porn tubes and VR tits in your face, the words on ASSTR still draw millions of views a month.