sex vs dirty story

sex and dirty story both are nouns.

Word	Noun	Adjective	Verb	Adverb
sex	Yes	No	Yes	No
dirty story	Yes	No	No	No

sex (noun)	dirty story (noun)
activities associated with sexual intercourse	an indelicate joke
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

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