The very notion of a “sex ethic” reflects the materialism and splitness of modern life, in which we increasingly define our identity sexually. Sexuality cannot be separated off from the rest of life. No sex act is “ethical” in and of itself, without reference to the rest of a person’s life, the patterns of the culture, the special circumstances faced, and the will of God. What we have are simply sexual mores, which change, sometimes with startling rapidity, creating bewildering dilemmas. Just within one lifetime we have witnessed the shift from the ideal of preserving one’s virginity until marriage, to couples living together for several years before getting married. The response of many Christians is merely to long for the hypocrisies of an earlier era.