“Let us first of all bring to mind the vast semantic range of the word ‘love’: we speak of love of country, love of one’s profession, love between friends, love of work, love between parents and children, love between family members, love of neighbor and love of God. Amid this multiplicity of meaning, however, one in particular stands out: love between man and woman, where body and soul are inseparably joined and human beings glimpse an apparently irresistible promise of happiness.”