Fics where either Clark or Lex is under the influence of illicit or experimental drugs or alcohol and it significantly impacts the story. (Episodes: Nicodemus, Kinetic, Witness, Shattered, Truth, Devoted)
Fics where Clark / Lex have amnesia or memory problems. (Episodes: Hug, Shattered, Asylum, Memoria, Crusade, Blank) May be cross-posted with Under The Influence.
Fics where Clark and/or Lex are/appear to be magic or mythical creatures or are affected by them. (Episodes: Hug, Shattered, Asylum, Memoria, Crusade, Blank)
Fics where a school assignment brings Clark and Lex together / Clark and Lex meet at college / Clark at college is a major point in story. (Episodes: Drone, Recruit)
Fics where Clark has an alien difference like bonding / physical feature / behavior. If it is only the ability to get pregnant see Daddy's Gonna Buy You A Mockingbird.
Fics where Clark and/or Lex are overlords (or resisting invaders/overlords) on or off Earth. (Episodes: Exile, Covenant, Commencement, Arrival, Solitude, Vessel, Zod)
Fics where main theme is centered around Clark's / Lex's secrets, either telling them or keeping them or after being exposed. May be cross-posted to You Must Remember This.
Fics where loss of virginity / first time (m/m) for Clark or Lex (or both) is a main theme. May be cross-posted with Ask Me No Questions, I'll Tell You No Lies.
Fics where main theme is Clark lost/is losing one or more of his powers either temporarily or permanently.(Episodes: Leech, Witness, Perry, Whisper, Mortal, Hidden)
Fics that have an physically/mentally injured or sick Lex / Clark being taken care of by the other or taking care of each other. May be cross-posted to Ask Me No Questions, I'll Tell You No Lies or Pardon Me, But Haven't We Met Before? or Somebody Save Me .
Fics involving time travel, alternate timelines, past lives, or manipulating time in any way. Warning: Character deaths (minor and major) are often the catalyst for time travel.
Fics where the CLex has ended permanently. Lex and/or Clark are dead or broken and can't be fixed, have turned evil, have broken up forever, or the Rift continues. These are not happy endings.