If it exists, there’s porn of it—no exceptions. That’s actually a rule of the internet. But most often, when we talk about fanfiction, we’re talking about a relationship between two guys. This is commonly known as “slash” (accordingly, a relationship between two girls is “femslash”, etc). It’s hard to explain this phenomenon to those outside fandom: the usual explanation runs something along the lines of, “Well, there are a lot of straight girls in fandom, and they like reading about two guys together… what?” I’ve used that explanation myself when trying to explain to my brother why, upon ascending to the internet, Harry Potter and Draco Malfoy can no longer keep their hands off each other. (To be fair, it was a much better explanation than the first one that popped into my head, which ran something along the lines of, “Because… shh”.) Now, however, there’s some legit data on the inner workings of fandom, and it means we might do well to rethink the assumptions that lead to this explanation.