Harry noticed he was running low on rubbers, so he stopped by the local drugstore.
"What size?" asked the blonde pharmacist's assistant sweetly.
When he admitted he wasn't sure of his size. The blonde led him into the back room, lifted her skirt and told him to enter her. He was delighted to oblige.
"Size six," she told him after a moment. "Now, take it out. How many?"
Harry bought a dozen, and on his way home, he ran into his friend Tom. Harry eagerly told Tom the whole story.
Tom rushed down to the drugstore to place on order, "But I'm afraid I don't know my size," he told the sales girl.
So the blonde led him in to the back room and repeated the procedure. "Size seven, Sir. Now take it out please. How many?"
But Tom kept on going until he was done. "None, thanks," he told her, zipping up his pants and grinning. "I just came in for a fitting."