After a few years of married life, this guy finds that he is unable to
perform anymore.  He goes to his doctor, and his doctor tries a few
things but nothing works.

Tired of trying to solve the guy's problem, the doctor says, "this is
all in your mind," and refers him to a psychiatrist.  After many
visits to the shrink, the shrink confesses, " I am at a loss as to how
you could possibly be cured."  Eventually even the psychiatrist tires
of the guy's problem and refers him to witch doctor.

The witch doctor assures the guy, "I can cure this", and throws some
powder on a flame, and there is a flash with billowing blue
smoke........ The witch doctor says "This is powerful healing, but you
can only use it ONCE A YEAR!  All you have to do is say '123' and it
shall rise for as long as you wish!"

Excitedly, the guy then asks the witch doctor "What happens when it's
over?"

The witch doctor says, "all you have to say is '1234' and it will go
down. But be warned it will not work again for a year!"

The guy goes home and that night and prepares to surprise his wife
with the good news.......  So, he is lying in bed with her and says
loudly, "123", and suddenly he gets an erection.

Whereupon his wife rolls over and says "What did you say '123' for?"