True, from the little kids' point-of-view, all they see is a body; any sexual element hasn't even begun to register. He/she with Mum/Dad are just washing. But the point's been made - 'kids are extra smart these days' and are aware of, and talk about, sexual things years before I ever did. So one could be dipping into dangerous waters without ever realising it.

I know members of my own family did this with their kids when they were small. There was absolutely no harm in it, I'm sure. But I couldn't understand then, and don't understand now, WHY adults find it necessary to do this.