A doctor, a lawyer and a mathematician were discussing the relative
merits of having a wife or a mistress.
The lawyer says: “For sure a mistress is better. If you have a wife
and want a divorce, it causes all sorts of legal problems.
The doctor says: “It’s better to have a wife because the sense of
security lowers your stress and is good for your health.
The mathematician says: ” You’re both wrong. It’s best to have both so
that when the wife thinks you’re with the mistress and the mistress
thinks you’re with your wife — you can do some mathematics.