Yeah, it evolved independently as a practice in several regions, including Africa and the Middle East, Australia, and South America.

A lot of hotter climates, for some reason. It was, presumably, a hygiene practice, so you can argue the practice for any culture with poor water access or high risk of skin infections.

Or one heavily influenced by a culture like that.

Mystra: It would be funny if we got mortals to cut off their dick skin.

Rest of the gods: 🤨