Elderly Couple

An elderly man was visiting the doctor for a routine check up. The doctor gives him the all clear and asked him, "Is there anything else bothering you?" The elderly man answered, "Well I find that the first time my wife an I have sex im hot and sweaty afterwards, but the second time I feel cold and chilly afterwards." The doctor told him he couldn't explain it but would look into it.

Later on that day the same doctor was examining the elderly mans wife and asked her the same question, "Is there anything else bothering you? Your husband claims that he feels hot and sweaty after the first time you have sex, but cold and chilly after the second time. Can you explain?"

"That stupid bastard," the woman answered.

"That's because the first time is usually in July and the second time is in December!"