Power. Brains. Maybe even a little cash. He may even be funny. Don’t underestimate the importance of funny in a marriage.
Shirley Partridge was married to some really ugly dude forever. Real beauty and the beast story. He made her laugh - that was it, and enough.
Henry Kissinger has said that ‘power’ is the greatest aphrodisiac. Women are attracted to both wealth and power, no matter what the men look like.