sexual love vs sex activity

sexual love and sex activity both are nouns.

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

As nouns, sex activity is a hypernym of sexual love; that is, sex activity is a word with a broader meaning than sexual love:

sexual love: sexual activities (often including sexual intercourse) between two people
sex activity: activities associated with sexual intercourse

Other hypernyms of sexual love include sex, sexual activity, sexual practice.

sexual love (noun)	sex activity (noun)
sexual activities (often including sexual intercourse) between two people	activities associated with sexual intercourse
a deep feeling of sexual desire and attraction