sexual vs sex

sexual is not a noun while sex is a noun.

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

sexual (noun)	sex (noun)
	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 (adjective)	sex (adjective)
having or involving sex
of or relating to or characterized by sexuality
involved in a sexual relationship

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