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A noted sex therapist realized that people often lied about the frequency of their
encounters, so he devised a test to tell, for certain, how often someone has had sex.

To prove his theory, he filled an auditorium with people, and went down the line,
asking each person to smile. Using the size of the person's smile, the therapist was
able to guess accurately until he came to the last man in line, an elderly gentleman,
who was grinning from ear to ear.

"Twice a day," the therapist guessed.

But the therapist was surprised when the man said no.

"Once a day, then?"

Again the answer was no.

"Twice a week?"

"No."

"Twice a month?"

"No."

The man finally said yes when the doctor got to once a year.

The therapist, angry that his theory isn't working, asks the elderly gentleman, "Just
what the hell are you so happy about?"

With a grin, the gent answered, "Tonight's the night!"

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