What metaphors are used in Talley's Folly by Lanford Wilson?

The plot is simple. On a trip to St. Louis Sally met Matt and they were attracted to one another. Now Matt, a forty-two-year-old Jewish accountant from the big city, has come to a small, reactionary rural community to ask the thirty-one-year-old spinster to marry him. There are problems, the least of which is the resistance by Sally's family. More important is what is expressed as the eggs metaphor —the "Humpty Dumpty Complex"—they are both "afraid to be cracked."