sexual activity vs unconventional

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

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

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

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