noun (n)

• creative activity (writing or pictures or films etc.) of no literary or artistic value other than to stimulate sexual desire(noun.act)

  Synonym:
  erotica, porn, porno, smut
  

  source: wordnet30
• Licentious painting or literature; especially, the painting anciently employed to decorate the walls of rooms devoted to bacchanalian orgies.(noun)

  source: webster1913