‘Marital faithfulness’ refers to faithful love for a spouse or lover to whom one is committed, rather than the narrower idea of sexual fidelity. The distinction is clearly marked in traditional wedding vows. A commitment to love faithfully is central: ‘to have and to hold from this day forward, for better for worse, for richer for poorer, in sickness and in health, to love and to cherish, till death us do part… and thereto I plight [pledge] thee my troth [faithfulness]’. (...) Sexual fidelity is promised in a subordinate clause, symbolizing its supportive role in promoting love's constancy: ‘and, forsaking all other, keep thee only unto her/him.’. (shrink)