WordNet (r) 3.0 (2006):

turned on
    adj 1: feeling great sexual desire; "feeling horny" [syn:
           aroused, horny, randy, ruttish, steamy, turned
           on(p)]

Moby Thesaurus II by Grady Ward, 1.0:

62 Moby Thesaurus words for "turned on":
   agog, ape about, aquiver, aroused, atingle, attracted, atwitter,
   bugs on, bursting, carried away, cathectic, concerned, cracked on,
   crazy about, curious, ebullient, effervescent, enthusiastic,
   excited, exhilarated, fascinated, fired, freaked-out, gaga over,
   gone on, hepped up over, high, hipped on, hopped up, hot about,
   impassioned, inflamed, interested, keen on, keyed up, lathered up,
   mad about, manic, moved, nuts about, nuts on, passionate, piqued,
   ready to burst, roused, starry-eyed over, steamed up,
   steamed up about, stimulated, stirred, stirred up, tantalized,
   thrilled, tickled, tingling, tingly, titillated, whipped up,
   wild about, worked up, wrought up, yeasty