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 had 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 how often
each person had sex. The last man in line was grinning from ear to
ear.

�Twice a day,� the therapist guessed, but was surprised when the man
said no. �Once a day, then?� Again the answer was no. �Twice a week?�

No.�

Twice a month?�

No.�

When the doctor asked, �Once a year?� the man finally said yes.

The therapist was angry that his theory hadn�t worked with this
individual, and he asked the man, �What the heck are you so happy
about?�

The man answered, �Tonight�s the night!�