Another one Steve found....

An elderly married couple scheduled their annual medical examination on the same
day so they could travel together.

After the examination, the doctor then said to the elderly man: "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." The old man stood there and looked extremely concerned.

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

The lady replied that she had no questions or concerns, that everything was just
dandy. The doctor then told her: "Well, your husband had 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.

Would you happen to know why?"

"Oh that crazy old son of a bitch!" she replied. "That's because the first time
is usually in July and the second time is usually in December!"