Benedict: Marriage is a Real Good for Society

True love between man and woman forms the nucleus of society:

There is a special urgency today to avoid confusion with other types of unions based on a weak love. Only the rock of total and irrevocable love between a man and woman is able to build a society that is home to all men. ...

The sexual differences in the bodies of men and women isn't just a biological fact, but holds a far more profound significance: It expresses that form of love with which the man and woman, becoming one body, can create a true communion of people open to the transmission of life.