The Collaborative International Dictionary of English v.0.48:

Libidinous \Li*bid"i*nous\ (-n[u^]s), a. [L. libidinosus, fr.
   libido, libidinis, pleasure, desire, lust, fr. libet, lubet,
   it pleases: cf. F. libidineux. See Lief.]
   Having lustful desires; characterized by lewdness; sensual;
   lascivious. -- Li*bid"i*nous*ly, adv. --
   Li*bid"i*nous*ness, n.
   [1913 Webster]

   Syn: Lewd; lustful; lascivious; unchaste; impure; sensual;
        licentious; lecherous; salacious.
        [1913 Webster]

WordNet (r) 3.0 (2006):

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