The Collaborative International Dictionary of English v.0.48:

Sexuality \Sex`u*al"i*ty\, n.
   The quality or state of being distinguished by sex.
   --Lindley.
   [1913 Webster]

WordNet (r) 3.0 (2006):

sexuality
    n 1: the properties that distinguish organisms on the basis of
         their reproductive roles; "she didn't want to know the sex
         of the foetus" [syn: sex, gender, sexuality]

Moby Thesaurus II by Grady Ward, 1.0:

51 Moby Thesaurus words for "sexuality":
   animality, bawdiness, carnality, clitoromania, coldness,
   concupiscence, dirtiness, eroticism, eroticomania, erotomania,
   flesh, fleshliness, frigidity, furor uterinus, goatishness,
   gynecomania, horniness, hysteromania, impotence, lasciviousness,
   lecherousness, lechery, lewdness, libidinousness, libido,
   lickerishness, love, lovemaking, lubriciousness, lubricity, lust,
   lustfulness, marriage, nymphomania, obscenity, potency, prurience,
   pruriency, randiness, salaciousness, salacity, satyriasis,
   satyrism, sensuality, sex drive, sexiness, sexual instinct,
   sexual urge, sexualism, uteromania, voluptuousness