The Collaborative International Dictionary of English v.0.48:

exhibitionist \exhibitionist\ n.
   1. a person with a compulsive desire to expose the genitals;
      -- usually a male. [WordNet sense 1]

   Syn: flasher. [WordNet 1.5]

   2. someone who deliberately behaves in such a way as to
      attract attention. [WordNet sense 2]

   Syn: show-off. [WordNet 1.5] exhibitionist

The Collaborative International Dictionary of English v.0.48:

exhibitionist \exhibitionist\ exhibitionistic
\exhibitionistic\adj.
   1. compulsively attracting attention to oneself especially by
      boasting or exaggerated behavior.
      [WordNet 1.5]

WordNet (r) 3.0 (2006):

exhibitionist
    n 1: someone with a compulsive desire to expose the genitals
         [syn: exhibitionist, flasher]
    2: someone who deliberately behaves in such a way as to attract
       attention [syn: exhibitionist, show-off]

Moby Thesaurus II by Grady Ward, 1.0:

26 Moby Thesaurus words for "exhibitionist":
   bugger, coprophiliac, erotomaniac, fetishist, flaunter,
   grandstand player, grandstander, hot dog, masochist, narcissist,
   necrophiliac, nymphomaniac, paraphiliac, pederast, pedophiliac,
   rapist, sadist, satyr, scotophiliac, show-off, showboat, sodomist,
   sodomite, transvestite, voyeur, zoophiliac