A maths teacher texts his wife;
Dear wife you are 54 yrs old and you can no longer satisfy my needs, so when you get this I shall be in a Motel with my 22yo assistant. I’m sorry I will be home late.
His wife sends him a reply;
Dear husband, you are also 54yrs old and by the time you read this I shall also be in a Motel with an 18yo toyboy. You’re a mathematician, so you’ll know 18 goes into 54 far more times then 54 goes into 22. Don’t wait up!!!