16th Floor Apartment

I'm a high-rise window cleaner. While cleaning a 16th-floor apartment window, I saw a couple kissing in bed. I could only see the man's back, but the woman was exceptionally beautiful, so I gentlemanly went to clean other floors first. When I returned, I found them still kissing. So I finished cleaning all the other floors, but when I came back to the 16th floor, I found only the upper half of a man left on the bed.