"Obviously the most enduring way to make this commitment is through marriage. Yet because sexual liberals deny the differences between the sexes, their explanations of why there are marriages and why marriage is needed and desired ignore the central truth of marriage: that it is built on sex roles. Pressed to explain the institution, they respond vaguely that human beings want "structure" or desire "intimacy." But however desirable in marriage, these values are not essential causes or explanations of it. In many cultures, the wife and husband share very few one-to-one intimacies. Ties with others of the same sex--or even the opposite sex--often offer deeper companionship. The most intimate connections are between mothers and their children. In all societies, male groups provide men with some of their most emotionally gratifying associations. Indeed, intimacy can deter or undermine wedlock. In the kibbutz, for example, where unrelated boys and girls are brought up together and achieve a profound degree of companionate feeling, they never marry members of the same child-rearing group. In the many cultures where marriages are arranged, the desire for intimacy is subversive of marriage. Similarly, man's "innate need for structure" can be satisfied in hundreds of forms of organization. The need for structure may explain all of them or none of them, but it does not tell us why, of all possible arrangements, marriage is the one most prevalent. It does not tell us why, in most societies, marriage alone is consecrated in a religious ceremony and entails a permanent commitment. As most anthropologists see it, however, the reason is simple. The very essence of marriage, Bronislaw Malinowski wrote, is not structure and intimacy; it is "parenthood and above all maternity." The male role in marriage, as Margaret Mead maintained, "in every known human society, is to provide for women and children." In order to marry, in fact, Malinowski says that almost every human society first requires the man "to prove his capacity to maintain the woman." Marriage is not simply a ratification of an existing love. It is the conversion of that love into a biological and social continuity. . . . Regardless of what reasons particular couples may give for getting married, the deeper evolutionary and sexual propensities explain the persistence of the institution. All sorts of superficial variations--from homosexual marriage to companionate partnership--may be played on the primal themes of human life. But the themes remain. The natural fulfillment of love is a child; the fantasies and projects of the childless couple may well be considered as surrogate children."