sex activity vs racy

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

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

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

sex 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