Webster's English Dictionary

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sex

1. sex \'seks\ n [ME, fr. L sexus] 1: either of two divisions of organisms 
   distinguished respectively as male  or female 2: the sum of the structural, 
   functional, and behavioral peculiarities of l iving beings that subserve 
   reproduction by two interacting parents and distinguish males and females 
   3a: sexually motivated phenomena or behavior  3b: SEXUAL INTERCOURSE 
2. sex vt 1: to identify the sex of {~ chicks}  2a: to increase the sexual 
   appeal of  2b: to arouse the sexual desires of