So-called “slash” fan fiction has been around since the 1970s and is usually written by women. Slash fan fiction is notable for taking characters from popular TV shows, movies and books and imagining them in romantic and sexual situations... normally sans the involvement of any female characters. For instance, slash fan fiction written about characters from Twilight probably underplays Bella or leaves her out entirely in favor of some hot mano a mano action with the male characters? Why? SImply because the average (lonely?) author of sexually charged fan fiction tends to be so besotted by the objects of their affections that they want no competition from other females, even if they are fictional!
So, as must seem pretty obvious by now, this leaves only the male characters to, er, indulge the sexual fantasies of the slash fiction writers. Starksy and Hutch, Batman and Robin, Sawyer and Jack from Lost, even Harry Potter and Draco Malfoy get it on in the pages of fan fiction. (I’ve seen Master and Commander slash as well).
Here’s a fun slash music video that examines the love that dares not speak its name between Kirk and Spock.