A fanfic motif (mainly associated with the superhero genre) where one or more characters, in a relationship, use secret identities or aliases. The character without a secret identity may be the one attempting to arrest the other or play the damsel in distress. Its also relevant for a superhero x villain ship, where neither the villain or the hero know that they're dating their worst enemy. Despite its name it doesn't always need a sexual component.
"That scene in Spiderman 2 with Peter and Osborne is so good! When Osborne takes off Peters mask; the identity porn kills me everytime."
by haunted typewriter February 14, 2022