sexual practice vs sex

sexual practice and sex both are nouns.

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

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

Other synonyms of sexual practice include sex activity, sexual activity.

sexual practice (noun)	sex (noun)
activities associated with sexual intercourse	activities associated with sexual intercourse
	the properties that distinguish organisms on the basis of their reproductive roles
	all of the feelings resulting from the urge to gratify sexual impulses
	either of the two categories (male or female) into which most organisms are divided

sexual practice (verb)	sex (verb)
	tell the sex (of young chickens)
	to evoke sexual feelings