When the math professor’s wife returns home from work, she finds an envelope on the living room table.
She opens it and finds a letter from her husband:
“My dearest wife, We have been married for nearly thirty years, and I still love you as much as on the day I proposed. You must realize, however, that you are now 54 years old and no longer able to satisfy certain needs I still have. I very much hope that you are not hurt to learn that, while you’re reading this, I’m in a hotel room with an 18-year-old freshman girl from my calculus class. I’ll be home before midnight.
Your husband, who will never stop loving you.” . . .
When the professor returns from the hotel shortly before midnight, he also finds an envelope in the living room.
He opens it and reads:
“My beloved husband, You may recall that you, too, are 54 years old and no longer able to satisfy certain needs I still have. I thus hope that you are not hurt to learn that, while you’re reading this, I am in a hotel room with the 18-year-old pool boy.
Your loving wife.
P.S. As a mathematician, you are certainly aware of the fact that 18 goes into 54 many more times than 54 goes into 18. Therefore, don’t stay up and wait for me.”