that 'rooster' is a euphemism invented in USA because it cannot be mistaken for a synonym of 'penis'

So "Little Red Rooster" is really about a chicken?
..............................

I'm astonished that no one eseems to have mentioned "bog" as an alternatuive to "loo".

In the middle ages the term of choice in monasteries and castles was "necessarium", which always seems a neat way of putting it.