Getting Sunbath on the Roof

A woman is lying on the roof of the hotel bathing in the sun. Suddenly a servant approaches and asks her to put on her clothes.
– “Why shall I do that? First of all, I’m lying on my stomach, and secondly, if anyone approaches they will still not be able to see anything because I have a towel.”
– “Yes, and thirdly, you are lying on the glass roof above the dining room!”