S: (n) sex (either of the two categories (male or female) into which most organisms are divided) "the war between the sexes"
S: (n) sex, sexual urge (all of the feelings resulting from the urge to gratify sexual impulses) "he wanted a better sex life"; "the film contained no sex or violence"
S: (n) sex, gender, sexuality (the properties that distinguish organisms on the basis of their reproductive roles) "she didn't want to know the sex of the foetus"