indecent vs sex activity

indecent is not a noun while sex activity is a noun.

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

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

indecent (adjective)	sex activity (adjective)
offensive to good taste especially in sexual matters
offending against sexual mores in conduct or appearance
not in keeping with accepted standards of what is right or proper in polite society