nouns
activities associated with sexual intercourse
"they had sex in the back seat"
either of the two categories (male or female) into which most organisms are divided
"the war between the sexes"
is a type of (narrower)
a collection of things sharing a common attribute
"there are two classes of detergents"
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"
the properties that distinguish organisms on the basis of their reproductive roles
"she didn't want to know the sex of the foetus"