A man was walking home late at night and sees a woman in the shadows.
'Twenty dollars...' she whispers.
He'd never been with a hooker before, but decides what the hell, it's only twenty bucks. So they hide in the bushes.
They're going 'at it' for a few minutes when all of a sudden a light flashes on them. It's a police officer.
'What's going on here, people?' asks the officer.
The man looks at the woman. "I'm making love to my wife," the man answers Indignantly.
"Oh, I'm sorry," says the cop, "I didn't know."
"Well, neither did I, 'til you shined that light in her face!"