WordNet (r) 3.0 (2006):

skin flick
    n 1: a pornographic movie

Moby Thesaurus II by Grady Ward, 1.0:

77 Moby Thesaurus words for "skin flick":
   3-D, Cinemascope, Cinerama, Rabelaisianism, Technicolor, Western,
   X-rated movie, animated cartoon, bawdiness, bawdry,
   black-and-white film, blue movie, cartoon, chiller, cinema,
   color film, creepie, dirt, dirtiness, dirty movie, documentary,
   documentary film, educational film, erotic art, erotic literature,
   erotographomania, feature, fescenninity, film, filth, filthiness,
   flick, flicker, foulness, horror picture, horse opera, iconolagny,
   lewdness, motion picture, motion-picture show, movie,
   moving picture, nastiness, newsreel, nudie, obscenity,
   offensiveness, photodrama, photoplay, picture, picture show,
   pornographic art, pornographic film, pornographic literature,
   pornographomania, pornography, preview, ribaldry, salaciousness,
   salacity, scurrility, sexploitation, short, silent, silent film,
   smut, smuttiness, sneak preview, soft-core pornography,
   spaghetti Western, stag film, talkie, talking picture, thriller,
   trailer, underground film, vileness