WordNet (r) 3.0 (2006):

pleasure seeker
    n 1: someone motivated by desires for sensual pleasures [syn:
         hedonist, pagan, pleasure seeker]

Moby Thesaurus II by Grady Ward, 1.0:

30 Moby Thesaurus words for "pleasure seeker":
   Cyrenaic, Heliogabalus, Sardanapalus, bon vivant, carouser,
   carpet knight, contestant, cutup, epicure, epicurean, frisker,
   frolicker, funmaker, gamboler, gourmand, gourmet, hedonist,
   merrymaker, playboy, player, pleasurer, pleasurist, reveler,
   rollicker, sensualist, sensuist, skylarker, swine, sybarite,
   voluptuary