The Collaborative International Dictionary of English v.0.48:

Pornographic \Por`no*graph"ic\, a.
   Of or pertaining to pornography; lascivious; licentious; as,
   pornographic writing.
   [1913 Webster]

WordNet (r) 3.0 (2006):

pornographic
    adj 1: designed to arouse lust; "pornographic films and
           magazines"; "adult movies" [syn: pornographic, adult]

Moby Thesaurus II by Grady Ward, 1.0:

36 Moby Thesaurus words for "pornographic":
   Fescennine, Rabelaisian, bawdy, blue, dirty, filthy, foul,
   foul-mouthed, foul-spoken, foul-tongued, fulsome, impure, indecent,
   ithyphallic, lewd, licentious, lurid, nasty, obscene, offensive,
   porno, prurient, raunchy, ribald, salacious, scurrile, scurrilous,
   smoking-room, smutty, sultry, taboo, unchaste, unclean,
   unprintable, unrepeatable, vile