unlawful vs sex activity

unlawful is not a noun while sex activity is a noun.

Word	Noun	Adjective	Verb	Adverb
unlawful	No	Yes	No	No
sex activity	Yes	No	No	No

unlawful (noun)	sex activity (noun)
	activities associated with sexual intercourse

unlawful (adjective)	sex activity (adjective)
contrary to or prohibited by or defiant of law
contrary to or forbidden by law
having no legally established claim
not morally right or permissible
not conforming to legality, moral law, or social convention