mc - Mind Control: I include this just in case I write an erotica that doesn't pertain to mind control.
mf - Male/Female Sex: Intercourse between male and female.
ff - Female/Female Sex: Intercourse between two females.
md - Male Dominant: The male is in control.
fd - Female Dominant: The female is in control.
rb - Robots: Either robots are used in the story or one or more subject is made to think or act like a robot.
vm - Vampires: The story involves vampires or vampirism.
fa - Fanfiction: The story involves characters created by someone who is getting paid for writing, or their world, or something from their world.
ci - Celebrity Involvement: The story involves a celebrity from our "real" world.
bd - Bondage and/or Discipline: Restraints, be they physical or psychological, are used.
tt - Time Travel: One or more persons make the journey through the fourth dimension to a different place in time.
hm - Humiliation: The person being made to submit is humiliated as part of their training or as punishment.
hu - Humor: A parody or humorous story.
cb - Comic Book Superhero or Superheroine: Comic-book-style superbeings are involved in the story (not always fanfiction)
sf - Science Fiction: Aliens, high tech devices beyond our science, space travel, etc.
la - Lactation: During the story, one or more subjects are made to lactate, or produce milk.
ts - Time Stop: Time is frozen for short periods through some means.
fu - Furries: Story includes characters who, while mostly humanoid in appearance, have some characteristics of animals.