The Collaborative International Dictionary of English v.0.48:

Lascivious \Las*civ"i*ous\ (l[a^]s*s[i^]v"[i^]*[u^]s), a. [L.
   lascivia wantonness, fr. lascivus wanton; cf. Gr. la`stauros
   lecherous, lh^n to wish, Skr. lash to desire.]
   1. Wanton; lewd; lustful; as, lascivious men; lascivious
      desires. --Milton.
      [1913 Webster]

   2. Tending to produce voluptuous or lewd emotions.
      [1913 Webster]

            He capers nimbly in a lady's chamber
            To the lascivious pleasing of a lute. --Shak.
      -- Las*civ"i*ous*ly, adv. -- Las*civ"i*ous*ness, n.
      [1913 Webster]

WordNet (r) 3.0 (2006):

lascivious
    adj 1: driven by lust; preoccupied with or exhibiting lustful
           desires; "libidinous orgies" [syn: lascivious, lewd,
           libidinous, lustful]

Moby Thesaurus II by Grady Ward, 1.0:

85 Moby Thesaurus words for "lascivious":
   Cyprian, Fescennine, amative, amatory, amorous, animal,
   aphrodisiomaniacal, appetitive, ardent, bawdy, blue, carnal,
   clitoromaniacal, coarse, concupiscent, debauched, desiderative,
   desireful, desiring, desirous, dirty, eager, ejaculatory, erotic,
   eroticomaniacal, erotomaniacal, fast, filthy, fleshly, goatish,
   gross, gynecomaniacal, hircine, hoping, hormic, horny, hot,
   hot-blooded, hysteromaniacal, impassioned, incontinent, indecent,
   itching, ithyphallic, lecherous, lewd, libertine, libidinal,
   libidinous, licentious, lickerish, loverlike, loverly, lubricious,
   lubricous, lurid, lustful, needing, nymphomaniacal, obscene,
   offensive, optative, orgasmic, orgastic, passionate, pornographic,
   priapic, prurient, randy, ribald, ruttish, salacious, satyric,
   sensual, sex-starved, sexual, sexy, smutty, steamy, tempted,
   unsatisfied, vile, wanting, wanton, wishing