“That was a long time ago, sweetheart,” he reassured her.
“But what if there’s a microphone somewhere? I’d be so embarrassed.”
So the groom searched under tables and behind pictures. Then he turned back the rug. Sure enough, there was a funny-looking gizmo in the floor.
He took out the screws, got rid of the hardware, and climbed into bed.
The next morning the newlyweds were awakened by a hotel clerk who wanted to know if they had slept well.
“We did,” replied the groom. “Why do you ask?”
“It’s rather unusual,” the clerk answered.
Spoiler:

