I have a more frivolous example, if you don’t mind. The modern Christian prohibition against “swearing” is a cultural construction. I grew up taking for granted that saying “dirty words" is biblically prohibited. My mother and her bar of soap agreed. 🤣

But while there are good reasons for teaching children not to speak in socially unacceptable ways, “swearing” as Christians define the practice today is not addressed in the Bible.

We know there are prohibitions in the Old Testament about taking oaths, but few biblical scholars profess much certainty on why those prohibitions existed and even what exactly they were prohibiting.

And instructions to not take the “name of the Lord thy God in vain" are clearly related to the Hebrew prohibition of speaking the name of God at all, not something modern Christians generally follow.

How any of that got connected to words that have to do with excretory or sexual functions is something of a mystery.

However it happened, though, it’s clearly cultural and not biblical.