The Collaborative International Dictionary of English v.0.48:

Luscious \Lus"cious\, a. [Prob. for lustious, fr. lusty, or
   perh. a corruption of luxurious. Cf. Lush, Lusty.]
   [1913 Webster]
   1. Sweet; delicious; very grateful to the taste; toothsome;
      excessively sweet or rich.
      [1913 Webster]

            And raisins keep their luscious, native taste.
                                                  --Dryden.
      [1913 Webster]

   2. Cloying; fulsome.
      [1913 Webster]

            He had a tedious, luscious way of talking.
                                                  --Jeffrey.
      [1913 Webster]

   3. Gratifying a depraved sense; obscene. [R.] --Steele. --
      Lus"cious*ly, adv. -- Lus"cious*ness, n.
      [1913 Webster]

WordNet (r) 3.0 (2006):

luscious
    adj 1: having strong sexual appeal; "juicy barmaids"; "a red-hot
           mama"; "a voluptuous woman"; "a toothsome blonde in a
           tight dress" [syn: juicy, luscious, red-hot,
           toothsome, voluptuous]
    2: extremely pleasing to the sense of taste [syn: delectable,
       delicious, luscious, pleasant-tasting, scrumptious,
       toothsome, yummy]

Moby Thesaurus II by Grady Ward, 1.0:

62 Moby Thesaurus words for "luscious":
   adorable, agreeable, ambrosial, appetizing, baroque, choice,
   cloying, dainty, darling, delectable, delicate, delicious,
   delightful, deluxe, distinctive, epicurean, exquisite, flamboyant,
   flavorsome, florid, good, good to eat, good-tasting, gustable,
   gusty, heavenly, juicy, likable, lush, luxuriant, luxurious,
   mawkish, mouth-watering, nectareous, nectarous, nice,
   of gourmet quality, opulent, oversweet, palatable, palatial,
   piquant, pleasant, pleasing, plush, rare, rich, rococo, saccharine,
   sapid, savorous, savory, scrumptious, sensual, sickly-sweet,
   succulent, sumptuous, sweet, tasty, toothsome, voluptuous, yummy