To me, bathing doesn't necessarily mean washing our body. It's a ritual for happiness, and that is why we name it "sukha" (happiness). I'd argue that the bathroom is only for relieving oneself. But its function goes beyond that as it is a place where we reward ourselves after a long, tiring day. Like our mind, our body needs special care too. Try it and see if you agree with me that you can feel content with your bathing ritual.