When you come across someone who really does smell bad, I think most of it comes from their unwashed clothes rather than their bodies. If they changed into clean clothes without a shower, you might not notice much (or any?) smell. We all wash far more often than is strictly necessary, because we've been trained very thoroughly by people marketing personal hygiene products! When I was young, most people had one bath and hair wash a week, but they didn't smell unless they were wearing sweaty clothes.