sex activity vs bodily process

sex activity and bodily process both are nouns.

Word	Noun	Adjective	Verb	Adverb
sex activity	Yes	No	No	No
bodily process	Yes	No	No	No

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

Other hypernyms of sex activity include activity, bodily function, body process.

sex activity (noun)	bodily process (noun)
activities associated with sexual intercourse	an organic process that takes place in the body