"New morality" follows the situation ethics set forth popularly by Joseph Fletcher. Fletcher summarized his view of ethics by saying, "We must always do what love requires in the situation." This maxim, if it stood alone, would be sound. We are always responsible to do what love demands in a situation. Love is the linchpin of the law of God. The problem remains how to know what love requires in a given situation. God's law reveals what God's love requires.
When Paul speaks of the ethics of love, he says, "And live a life of love, just as Christ loved us..." (Eph. 5:2). But the apostle does not stop with an ambiguous appeal to love. In the next breath he says, "But among you there must not be even a hint of sexual immorality, or any kind of impurity, or of greed, because these are improper for God's holy people" (Eph. 5:3). Here the law of God defines what is consistent with love. Appeals to love are frequently used to excuse sin. The oldest ploy in the world for sexual seduction is, "If you love me, you will." Yet Paul declares, "If you love God, you won't. Ever."
—R. C. Sproul, Playing God