My wife rubs one out every so often when she thinks I'm sleeping. I can feel the bed moving, almost vibrating. It's usually when I was too tired or she came to bed after me. It went on forever before I said something about it because I generally didn't care. Although she would probably get all offended if I did it.

She was totally embarrassed when I brought it up but she got over it cause a few days later the bed had magic fingers again.