a woman who commits unlawful sexual intercourse and does not reserve herself for her husband alone, but has intercourse with him and with others, then her husband too is guilty of unlawful sexual intercourse: he and the others share sexual access to her, just as men who commit unlawful sexual intercourse share the same woman. For this reason, he must deny paternity of a child who is not his. Thus, whoever marries a woman who commits unlawful sexual intercourse is himself guilty of it—meaning that he marries her—and whoever marries a man who commits unlawful sexual intercourse is herself guilty of it—meaning that she marries him.

Many men who commit unlawful sexual intercourse confine themselves to particular women who do likewise: a woman becomes a man’s mistress and intimate companion, and he has intercourse with no other woman. When a man commits unlawful sexual intercourse, he does not keep his wife chaste. If he does not keep her chaste, she longs for another man and has unlawful sexual intercourse with him. This is commonly the case with the wives of men who commit unlawful sexual intercourse or sodomize boys. Their wives commit unlawful sexual intercourse to satisfy their needs and desires, and to spite their husbands thereby. Since their husbands do not restrain themselves from women other than their wives, the wives likewise do not restrain themselves from men other than their husbands.

For this reason, it is said:

“Be chaste, and your wives and sons will be chaste; treat your fathers well, and your sons will treat you well.”

Recompense corresponds to the deed: as you deal with others, so will you be dealt with. One punishment for an evil deed is another evil deed that follows it. If a man willingly marries a woman who commits unlawful sexual intercourse, he accepts that his wife should commit it. Allah Most High has placed affection and mercy between spouses, so each desires for himself or herself what he or she desires for the other. Thus, if a woman willingly marries a man who commits unlawful sexual intercourse, she approves of his conduct. Likewise, if a man willingly marries a woman who commits unlawful sexual intercourse, he approves of her conduct. Whoever approves of unlawful sexual intercourse is like one who commits it, for the foundation of an act is the will to perform it. Hence the report states: “Whoever is absent when a sin is committed, yet approves of it