DS aged 6 is fascinated with other people's feet. He will seize on any opportunity to suggest doctors and nurses, socks will come off and he will rub and smell the other child's feet!! This only happens with girls, older or younger, and has even happened with out 67 year old neighbour when babysitting!!! I find this deeply weird, he is quite embarrassed and secretive about this, shouting at me if I come into the room etc. Is this normal??!! I guess it could be worse......