In past centuries only the wealthy had bedrooms and even then, to get any privacy, they had to draw the curtains around their four-posters. But for any word of what went on, other than sleep, you have to wait until the 1930s. 

In the third instalment, about the bedroom, much energy is directed at keeping presenter Lucy Worsley at the centre of the screen in historical re-enactments. She remains on the sidelines, though, when a young couple try out a chaste bedroom test for the unmarried. 
There’s a fair sprinkling of fascinating facts and some glorious period pieces here but, if walls really could talk, Dr Worsley would still have the last word.