No big deal really. I used to work in the hotel business in NYC long ago.
Worst story was due to a mixup at the front desk, a family was checked into a room that was occupied already. The bellman opened the door and the two excited young kids just ran in. Unfortunately, the couple in the room where in bed going at it right at that moment.
All parties got compt for everything during their whole stay to avoid a lawsuit.
Housekeepers and room service see nude people happens all the time. Unfortunately, at lot of guests do it intentionally.
As others have suggested, please throw the bolt when you are in the room.
P.S. A hotel sofa is quite promiscuous. They aren't deep cleaned after every checkout. I'm sure pathogen-wise, it is worse than a public toilet. Put a towel on it first, if you are nude.