The Collaborative International Dictionary of English v.0.48:

erogenous \erogenous\ adj.
   1. causing sexual excitement when stimulated.
      [PJC]

   2. relating to or arousing sexual excitement.
      [PJC]

WordNet (r) 3.0 (2006):

erogenous
    adj 1: sensitive to sexual stimulation

Moby Thesaurus II by Grady Ward, 1.0:

23 Moby Thesaurus words for "erogenous":
   amorous, carnal, erogenic, erotic, erotogenic, fleshly, gamic,
   heterosexual, libidinal, nuptial, oversexed, potent, procreative,
   sensual, sex, sexed, sexlike, sexual, sexy, straight, undersexed,
   venereal, voluptuous