sexual activity vs racy

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

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

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

sexual activity (adjective)	racy (adjective)
	designed or suitable for competing in a race
	suggestive of sexual impropriety
	full of zest or vigor
	marked by richness and fullness of flavor