A maths teacher and his wife...

A maths teacher and his wife were both 54 years old. One evening the wife came home and found a note from her husband. It said: "My dear, you are 54 years old and there are some things you are not giving me, so I am at the Holiday Inn with my 18-year-old student. Don't bother waiting up for me."

He returns home that night to find a note from his wife: "You are also 54 years old and there are things I need that you're not giving me. So I am at the Hotel with one of your 18-year-old students and you should know that 18 goes into 54 way more than 54 goes into 18, so don't *you* wait up for me."