An elderly couple went in together for their annual medical examinations. After examining the man, the doctor then said,

"You appear to be in good health. Do you have any medical concerns that you would like to ask me?"

"In fact, I do," said the old man. "After I have sex with my wife the first time, I am usually hot and sweaty, and then, after I have sex with my wife the second time, I'm usually cold and chilly."

After examining the elderly lady, the doctor said: "Everything appears to be fine. Do you have any medical concerns that you would like to discuss with me?"

The wife replied that she had no questions or concerns.

The doctor then asked: "Your husband has an unusual concern. He claims that he is usually hot and sweaty after having sex the first time with you and then cold and chilly after the second time.

Do you have any idea why?"

"Oh that crazy old fart!" she replied.

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