The Collaborative International Dictionary of English v.0.48:

Genitals \Gen"i*tals\, n. pl. [From Genital, a.: cf. L.
   genitalia.]
   The organs of generation; the sexual organs; the private
   parts.
   [1913 Webster]

WordNet (r) 3.0 (2006):

genitals
    n 1: external sex organ [syn: genitalia, genital organ,
         genitals, private parts, privates, crotch]

Moby Thesaurus II by Grady Ward, 1.0:

47 Moby Thesaurus words for "genitals":
   bag, ballocks, balls, basket, beard, breasts, cervix, clitoris,
   cod, cods, cullions, family jewels, female organs, genitalia,
   gonads, labia, labia majora, labia minora, lingam, lips,
   male organs, meat, nuts, nymphae, ovary, parts, penis, phallus,
   private parts, privates, privy parts, pubic hair, pudenda,
   reproductive organs, rocks, scrotum, secondary sex characteristic,
   secrets, sex organs, spermary, testes, testicles, uterus, vagina,
   vulva, womb, yoni