Ship Pairings  Fanfiction containing relationships between characters of different genders (i.e. male/female).
General  Fanfiction that does not contain any relationships between the characters beyond that seen in canon. Usually stories related to missions or characters without any romantic subplot.
Slash Pairings  Fanfiction containing relationships between characters of the same gender (i.e. male/male or female/female).
Bitextual  Stories that contain both same sex relationships and relationships between people of opposite genders. Includes triangles (e.g. Sheppard/McKay and Sheppard/Weir in the same story). Threesomes (e.g. Sheppard/McKay/Weir) are filed under Threesomes and Moresomes.
Threesomes and Moresomes  Fanfiction containing relationships between three or more characters, either of different or the same gender (e.g. male/male/female or male/male/male).
Crossovers  Fanfiction relating to both Stargate: Atlantis and Stargate SG-1, or in universes where the characters from Stargate: Atlantis interact with characters from other shows, movies, books etc.