"The other day I touched my husband's balls and realized that they are cold. Never noticed before!" - says the first.

Next day the second woman tells to the others:

"That's true! I touched my husband's balls and they are also cold. It's curious."

Next day the third woman appears with her eye blacked.

"What happened?" - her friends wonder.

"Well, I touched my husband's balls and then asked him why his balls are warm but all other men have them cold."