"Both?" said the doctor and the lawyer. "Yes," said the mathematician, "That way the wife thinks I'm with the girlfriend, the girlfriend thinks I'm with the wife and I can do some math."
The greatest lovers of math though are not the famous mathematicians at places like Berkeley and Harvard. Rather the mathematicians who take low-paying jobs with high teaching loads at less-strong colleges or move from visiting position to visiting position just to have some occasional time to do math. They have a dedication (or perhaps an addiction) I can never fully appreciate.