extramarital sex vs sex

extramarital sex and sex both are nouns.

Word	Noun	Adjective	Verb	Adverb
extramarital sex	Yes	No	No	No
sex	Yes	No	Yes	No

extramarital sex (noun)	sex (noun)
sexual intercourse between individuals who are not married to one another	activities associated with sexual intercourse
	the properties that distinguish organisms on the basis of their reproductive roles
	all of the feelings resulting from the urge to gratify sexual impulses
	either of the two categories (male or female) into which most organisms are divided

extramarital sex (verb)	sex (verb)
	tell the sex (of young chickens)
	to evoke sexual feelings