reproduction vs sex activity

reproduction and sex activity both are nouns.

Word	Noun	Adjective	Verb	Adverb
reproduction	Yes	No	No	No
sex activity	Yes	No	No	No

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

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

reproduction (noun)	sex activity (noun)
the sexual activity of conceiving and bearing offspring	activities associated with sexual intercourse
the act of making copies
copy that is not the original; something that has been copied
recall that is hypothesized to work by storing the original stimulus input and reproducing it during recall
the process of generating offspring