An old married couple scheduled their annual medical examinations on the same day so they could travel together. After the examination, the doctor then asks the old man, "You appear to be in good health, but do you have any medical concerns that you would like to discuss with me?"
"In fact, I do. After I have sex with my wife for the first time I am usually hot and sweaty. And then after I have sex the second time Im usually cold and chilly."
"This is very interesting." Said the doctor. "I have never heard of this before. Let me do some research and I will back to you."
After examining the wife, the doc said, "Everything seems to be fine. Do you have any medical concerns that you would like to discuss with me?" The lady replied that she had no questions. The doctor then asked, "Your husband had an unusual concern. He says after having sex the first time, he's usually hot and sweaty. The second time after sex, he's usually cold and chilly. Do you know why?"
"Oooh! That old coot!" Replied the lady. "That's because the first time we have sex is usually in July, and the second time we have sex is usually in December."