sexual activity vs sexual practice

sexual activity and sexual practice both are nouns.

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

As nouns, sexual activity and sexual practice are synonyms defined as:

sexual activity and sexual practice: activities associated with sexual intercourse

Other synonyms of sexual activity include sex, sex activity.

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