lustful vs sexual activity

lustful is not a noun while sexual activity is a noun.

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

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

lustful (adjective)	sexual activity (adjective)
vigorously passionate
characterized by lust
driven by lust; preoccupied with or exhibiting lustful desires