Maybe the three women in question were engaging in 'Performance Art' along the lines of Gilbert and George? All I can think of when 3 ladies come to mind is a ditty from my schooldays, as in locked in .....
Perhaps we should draft in Tracy Emins bed.......or maybe we could rotate the beds of local dignitaries or famous people, if you'll pardon the suggestion - one week Vics bed, another week PaulBs, and so on. Any offers?