A noted sex therapist is giving a talk, and during the course of it he tells his audience that people often lie about the frequency of their sexual activity. He says, however, that he has a test to tell for certain how often someone has sex: He uses the size of the person's smile as an indicator.
To prove his theory, he goes row by row, asking each person to smile. He guesses the frequency of everyone's sexual activity with uncanny accuracy.
The last man in line is grinning from ear to ear, and the therapist figures he has an easy one.
"Twice a day," the sex therapist says.
"No," says the man.
"Once a day, then?" Again the answer is no.
"Twice a week?"
"No."
"Twice a month?"
"No."
Finally the doctor says, "Once a year?" and the man says "Yes."
"Well," says the therapist, perturbed that his theory hasn't proved out, "what the heck are you so happy about?"
The man with the big smile says, "Tonight's the night!"
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