In a double bedded room, in a star hotel, sometimes three pillows are given. What is the role of the 3rd. one?

Question

Is it for using during sex?

Answer 1

It's just a courtesy. Some people, like myself, sleep with multiple pillows. I like two pillows under my neck and one behind my back, so that third pillow would prevent a room service call.

Answer 2

And you'd probably find yet another pillow in the closet. Some people prefer to sleep with multiple pillows, so extra pillows are in the room just in case.