A sixty year old man walks into a drug store and walks up to the girl at the checkout counter. He asks her, "Do you sell condoms here?"

"Sure. What size are you?"

"I don't know," he replies.

"Well, just let me check," the cashier says. She unzips his pants, takes a feel, and then says over the intercom, "Extra large condoms to the checkout counter please. Extra large condoms to the checkout counter."

A clerk returns with some condoms. The man pays for them and leaves the store.

Later, a thirty year old man walks into the store and up to the checkout counter. He asks the girl, "Do you sell condoms here?"

The cashier replies, "Sure. What size do you need?"

"Well, I don't know."

"Allow me to check for you," she says as she unzips his pants and takes a couple of tugs. She then says over the intercom, "Large condoms to the checkout counter please. Large condoms to the checkout counter."

A clerk returns with some condoms. The man pays for them and leaves the store.

Some time later, a fifteen year old boy, hoping to get lucky, walks up to the girl at the checkout counter and asks sheepishly, "Um, ah, do you guys sell condoms here?"

"Yep," she says. "What size do you need?"

"I don't know," he says nervously.

"Allow me to check for you," she says. The cashier unzips his pants for a feel, pauses for a moment and then says over the intercom, "Clean up at the checkout counter please. Clean up at the checkout counter."