"Whole Wheat Aphrodisiac" joke

Two very elderly men were having a conversation about sex:

1st: Yes sir, I did it three times last night with a 30 year old!

2nd: You're kidding! I can't even manage to do it once! What's your secret?

1st: Well, the secret is to eat lots of whole-wheat bread. I'm not kidding!

So the second old man rushed to the store.

Clerk: May I help you?

Old man: Yes, I'd like four loaves of whole-wheat bread, please.

Clerk: That's a lot of bread! It's sure to get hard before you're done!

Old man: Darn! Does EVERYONE know about this except me?