We don't hide nakedness in our house. My daughter is 4 and a half and my son is approaching two and a half. I have decided that I'm going to start closing the door when I'm changing and stuff like that, but if my daughter or son walk in on me, I will make no effort to hide or act like it's wrong. Not sure when my husband will make a similar decision. We haven't talked about it recently. However, if adults don't teach that it's weird or wrong, kids just accept nakedness as normal. We do talk about not being naked in public though.