People Did Their Business Behind Closed Doors
The outhouses of the 18th and 19th centuries were designed based on the example that medeival bathrooms set up—though outhouses were at least a bit more approachable.
Instead of relieving oneself in public, it was much more respectful and dignified to go into an outhouse and do your business behind closer doors. After all, folks in colonial America prioritized cleanliness and privacy when it came to intimate affairs.