usage vs sexual activity

usage and sexual activity both are nouns.

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

usage (noun)	sexual activity (noun)
the act of using	activities associated with sexual intercourse
accepted or habitual practice
the customary manner in which a language (or a form of a language) is spoken or written