 Due to the lack of canonical homosexual relationships in source media at the time, some came to see slash fiction as being exclusively outside of canon.These people held that the term "slash fiction" only applies when the relationship being written about is "not" part of the source's canon, and that fan fiction about canonical same-sex relationships is hence not slash.The recent appearance of openly gay and bisexual characters on screen, such as Willow and Tara in the television series "Buffy the Vampire Slayer", the characters of "Queer as Folk", Jack Harkness in "Doctor Who", and numerous characters in "Torchwood", has added much to this discussion.