A farmer and his wife were laying in bed one night, the farmer feeling a
little frisky, reaches over and gives his wife's breast a little feel
and says, "Mother, if this could give milk, we could get rid of the
cow."
His hand then travels down to her crotch, and he says, "Mother, if this could give eggs, we could get rid of the chickens."
His wife then reaches over and grabs his penis. "Father, if this could stay hard, we could get rid of your brother."