sex activity vs unconventional

sex activity is a noun but unconventional is not a noun.

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

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

sex activity (adjective)	unconventional (adjective)
	not conforming to accepted rules or standards
	not conventional or conformist
	not conforming to legality, moral law, or social convention