Two elderly men were talking about their sex lives. One told the
other, "I had sex with a 30-year-old three times last night."

The friend said, "Wow. You must be using that Viagra."

"No," the man said. "I know a little secret: wheat bread. Eat lots of
it and you can have sex for hours."

So the second man ran to the nearest supermarket and grabbed six
loaves of wheat bread. At the checkout counter the cashier said,
"That's a lot of bread. It will probably get hard before you're done
eating it all."

"Well, I'll be damned," the man said. "Does everyone know about this
wheat bread thing but me?"