Logic Framework to test the Question: Why do beautiful women marry unattractive men and good looking men marry beautiful women?

Some people have this idea that although Good-looking women marry not so good looking men, Good looking men do marry good looking women.  But is that true?  Here is an interesting mathematical argument.
Read Quote of Gayle Laakmann McDowell’s answer to Attractiveness and Attractive People: Why do good looking women often marry men who are way less attractive while good-looking men more-often marry good-looking women? on Quora