A man goes to see his Doctor...
"Doctor" he says, "I can't understand it but, whenever I have sex with my wife, the first time we make love I'm absolutely freezing cold but then, the second time I'm boiling hot and can't stop sweating."
"Strange" says the Doctor, "I've never heard of a case like this before. The first time you make love you're freezing cold and the second time, you're boiling hot?"
"That's right Doctor!"
"Well we'd better examine you" says the Doctor, who carries out a full examination but can find nothing wrong with the man.
"Very strange!" says the doctor "Is your wife here with you?"
"Yes, she's in the waiting room."
"Ok, let me talk with her."
So, the man's wife comes into the surgery...
"Good day, madam. Your husband tells me that when you have sex, the first time he makes love to you he's freezing cold and the second time he's boiling hot!"
"Can you explain this strange phenomenon?"
"Yes" says the wife.
"You can! Then why is it?"
"Because the first time is in January and the second time is in August."

