Sexual Frequency

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

To prove his theory, he filled up 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 comes to the last man in line, that is. This guy was grinning from ear to ear.

"Twice a day," the therapist guessed, but is 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 was angry that his theory wasn't working, and asked the man, "What the heck are you so happy about?"

The man answered, "Tonight's the night!"