Incest is a somewhat popular topic in erotic fiction; there are many entire collections and websites devoted solely to this genre, with an entire genre of pornographic pulp fiction known as "incest novels". This is probably because, as with many other fetishes, the taboo nature of the act adds to the titillation. With the advent of the Internet, even more of this type of fiction is available. Incest has also been a recurring subject in Japanese anime.
Incest portrayed in literature is not just a twentieth-century phenomenon. There was an explosive proliferation of stories about incest in 13th century French literature. Incest is not popular only in America, France and Japan but in the entire world, and all date backs in ancient times.