The Certificate.
Did you hear about the bloke that was talking to his mate, when he said, "I don't know what to get my wife for her birthday. She has everything, and besides, she can afford to buy anything she wants. So, I'm stumped."
His mate said, "I have an idea. Why don't you make up a certificate that says she can have two hours of perfect sex, any way she wants it. She'll probably be thrilled!" So the first blokedid just that. The next day his mate asked, "Well, did you take my suggestion? How did it turn out?"
"She loved it. She jumped up, thanked me, kissed me on the mouth, and ran out the door yelling, 'I'll see you in two hours'."