Whole-Wheat Bread

Two very elderly men were having a conversation about sex.
Elmer says, �Yes sir, I did it three times last night with a 30 year old!�
Leon replies, �You're kidding! I can't even manage to do it once! What's your secret?�
To which Elmer said, �Well, the secret is to eat lots of whole-wheat bread. I'm not kidding!�
So the second old man rushed to the store.
The clerk asks the old man, �May I help you?�
�Yes, I'd like four loaves of whole-wheat bread, please,� said Leon.
�That's a lot of bread! It's sure to get hard before you're done!� the clerk remarked.
Leon replies, �Damn! Does everyone know about this except me?�