sexual practice vs sexual activity

sexual practice and sexual activity both are nouns.

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

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

sexual practice and sexual activity: activities associated with sexual intercourse

Other synonyms of sexual practice include sex, sex activity.

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