WordNet (r) 3.0 (2006):

exhibitionism
    n 1: extravagant and conspicuous behavior intended to attract
         attention to yourself
    2: the perverse act of exposing and attracting attention to your
       own genitals [syn: exhibitionism, immodesty]

Moby Thesaurus II by Grady Ward, 1.0:

89 Moby Thesaurus words for "exhibitionism":
   active algolagnia, algolagnia, algolagny, amphierotism,
   autoeroticism, baring, bisexuality, blazon, boldness, bravura,
   brazenness, brilliancy, coprophilia, daring, dash, demonstration,
   denudation, desquamation, display, divestment, dramatics, eclat,
   etalage, excoriation, exfoliation, exhibition, exposure,
   false front, fanfaronade, fetishism, figure, flagrancy, flair,
   flaunt, flaunting, flourish, forwardness, heterosexuality,
   histrionics, homoeroticism, homosexualism, homosexuality,
   immodesty, impudicity, incest, incestuousness, indecent exposure,
   laying bare, lesbianism, manifestation, masochism, narcissism,
   necrophilia, notoriousness, pageant, pageantry, parade, paraphilia,
   passive algolagnia, pedophilia, removal, sadism, sadomasochism,
   sapphism, scotophilia, sexual inversion, sexual normality,
   sexual preference, sham, shamelessness, show, showing-off,
   spectacle, splash, splurge, staginess, stripping,
   swinging both ways, theatrics, transvestitism, tribadism, tribady,
   uncovering, unembarrassedness, unmodestness, vaunt, voyeurism,
   zooerastia, zoophilia