Not quite the same as leaving expensive electronic equipment around, but I remember going to the home of a wg for the first time and when she went to change into her sexy gear, I noticed several items of post scattered around. She obviously wasn't too fussed about hiding her real identity.
Fair enough, I was in what was clearly her home rather than workplace so knew where she lived, but I still thought it a bit naive to leave stuff with her full name lying around.
As to sitting in another room while a punter has a 15 min quickie
I no longer always try to book first slot of the day as I am less squeamish now, but I think I would draw the line at this.