You wouldn't believe what I sometimes saw in the toilets when I worked as a bartender. I also know some hotel workers, and I can tell you that picking up condoms under the bed is a regular occurence. The really nasty things are when the guests are more into... sexual fetishes involving fecal matter.

Surprise: not the escorts book the rooms, but the clients, and the most weird stuff is usually found within the wealthier client groups.