An old couple were sitting on the porch one afternoon rocking in their rocking chairs. All of a sudden the old man reaches over and slaps his wife.

She says, "Well what was that for?"
He says, "That’s for 40 years of rotten sex!"
She doesn’t reply and they start rocking again.
All of the sudden the old lady reaches up and slaps her husband.
He says, "Well what was that for?"
She says, "That’s for knowing the damn difference!!"lmaolmao