Two couples were playing cards. John accidentally dropped some cards on the floor. When he bent down under the table to pick them up, he noticed that Bill's wife was not wearing any underwear.
Later, John went to the kitchen to get some refreshments. Bill's wife followed him and asked, "Did you see anything that you liked under there?"
John admitted that, well, yes he did.
She said "You can have it, but it will cost you $100."
John indicated that he is interested. She tells him that since Bill works Friday afternoons and John doesn't, John should come to her house around 2:00 PM on Friday. On Friday, John went to her house at 2:00 PM. After paying her $100 they went to the bedroom. John got what he paid for and then left.
Bill came home about 6:00 PM and asked his wife, "Did John come by this afternoon and give you a hundred dollars?"
Reluctantly, she replied, "Well, yes he did." She thinks to herself, "My God! He knows!"
"Good," Bill says. "John came by the office this morning and borrowed $100 from me. He said that he would stop by our house on his way home and pay me back."