X -rye bread

Two old guys, one 80 and one 87, were sitting on their usual park
bench one morning.

The 87 year old had just finished his morning jog and wasn't even
short of breath.

The 80 year old was amazed at his friend's stamina and asked him what
he did  to have so much energy.

The 87 year old said, "Well, I eat rye bread every day.  It keeps your
energy level high and you'll have great stamina with the ladies."

So,  on the way home, 80 year old stops at the bakery.  As he was
looking around, the lady asked if he needed any help. He said  "Do you
have any Rye bread?"

She said,  "Yes, there's a whole shelf of it. Would you like some?"

He said,  "I want 5 loaves."

She said, "My goodness, 5 loaves...by the time you get to the 5th
loaf, it'll be hard."

He replied,  "I can't believe it, everybody knows about this shit but me..