1-2-3-for?

On Jack's 60th birthday, Jack got a gift certificate from his wife. The certificate paid for a visit to a shaman living on a nearby reservation who was rumoured to have a wonderful cure for erectile dysfunction. After being persuaded, Jack drove to the reservation, handed his ticket to the shaman, and he wondered what was he in for.

The old man slowly, methodically produced a potion, handed it to him, and with a grip on his shoulder, warned, "This is powerful medicine and it must be respected. You take only a teaspoonful and then say "1-2-3." When you do that, you will be more manly than you have ever been in your life, and you will be able to perform as long as you want."

Jack was encouraged. As he walked away, Jack turned and asked, "How do I stop the medicine from working?" "Your partner must say "1-2-3-4," the shaman responded."But when she does, the medicine will not work again until the next full moon."

Jack was eager to see if it worked. Jack went home, showered, shaved, took a spoonful of the medicine, and then invited Cara to join him in the bedroom. When she came in, Jack took off his clothes and said, "1-2-3!" Immediately, Jack was the manliest of men. Cara was excited and began throwing off her clothes. And then she asked, "What was the 1-2-3 for?"