The Collaborative International Dictionary of English v.0.48:

Titillate \Tit"il*late\ (t[i^]t"[i^]l*l[=a]t), v. t. & i. [imp.
   & p. p. Titillated (t[i^]t"[i^]l*l[=a]`t[e^]d); p. pr. &
   vb. n. Titillating.] [L. titillatus, p. p. of titillare.]
   1. To tickle; as, to titillate the nose with a feather.
      [1913 Webster]

            The pungent grains of titillating dust. --Pope.
      [1913 Webster]

   2. To arouse an agreeable sensation in; as, to titillate
      one's imagination; to titillate one's audience; to
      titillate the senses.
      [PJC]

WordNet (r) 3.0 (2006):

titillating
    adj 1: pleasantly and superficially exciting
    2: giving sexual pleasure; sexually arousing [syn: erotic,
       titillating]
    3: exciting by touching lightly so as to cause laughter or
       twitching movements [syn: tickling, tingling,
       titillating]

Moby Thesaurus II by Grady Ward, 1.0:

73 Moby Thesaurus words for "titillating":
   alluring, amusing, appealing, appetizing, attractive, beguiling,
   bewitching, blandishing, cajoling, captivating, catching,
   charismatic, charming, coaxing, come-hither, coquettish,
   delightful, diverting, enchanting, engaging, enravishing,
   entertaining, enthralling, enticing, entrancing, exciting, exotic,
   fascinating, fetching, flirtatious, fun, glamorous, humorous,
   hypnotic, interesting, intriguing, inviting, irresistible, juicy,
   lively, mesmeric, mouth-watering, piquant, prepossessing,
   provocative, provoking, provoquant, racy, ravishing, readable,
   recreational, rich, seducing, seductive, siren, sirenic,
   spellbinding, spellful, spicy, stimulating, succulent, taking,
   tantalizing, teasing, tempting, thought-challenging,
   thought-inspiring, thought-provoking, tickling, titillative,
   winning, winsome, witching