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The Christian understanding of sexuality, marriage, and family has been strongly influenced by the Old Testament view of marriage as an institution primarily concerned with the establishment of a family, rather than sustaining the individual happiness of the marriage partners. In spite of this, a transformation occurred from the early days of Christianity. This transformation is evident in the New Testament departure from the Hellenistic understanding of love. The classical understanding of love, expressed in the Platonic concept of eros, was opposed in the Christian community by the biblical understanding of love, agape. Although erotic love has frequently been understood primarily as sexual desire and passion, its classical religious and philosophical meaning was the idealistic desire to acquire the highest spiritual and intellectual good. The early Christian perception of eros as the most sublime form of egocentricity and self-assertion, the drive to acquire the divine itself, is reflected in the fact that the Greek New Testament does not use the word erōs but rather the relatively rare word agapē. Agapē was translated into Latin as caritas and thus appears in English as charity and love. The Christian concept of love understood human mutuality and reciprocity within the context of God’s self-giving love, which creates value in the person loved. “We love, because he first loved us. If any one says, ‘I love God,’ and hates his brother, he is a liar; for he who does not love his brother whom he has seen, cannot love God whom he has not seen. And this commandment we have from him, that he who loves God should love his brother also” (1 John 4:19–21). Love is presented as the greatest of the virtues (1 Corinthians 13:13) as well as a commandment. The Christian community understood faith active in love primarily in terms of voluntary obedience rather than emotion and applied this understanding to every aspect of life, including sexuality, marriage, and family.

The tendency to spiritualize and individualize marriage

Christianity has contributed to a spiritualization of marriage and family life, to a deepening of the relations between marriage partners and between parents and children. During the first decades of the church, congregational meetings took place in the homes of Christian families. The family, indeed, became the archetype of the church. Paul called the members of his congregation in Ephesus “members of the household of God” (Ephesians 2:19). In the early church, children were included in this fellowship. They were baptized when their parents were baptized, took part in the worship life of the congregation, and received Holy Communion with their parents. The Eastern Orthodox Church still practices as part of the eucharistic rite Jesus’ teaching, “Let the children come to me, and do not hinder them.”

In the early church the Christian foundation of marriage—in the participation of Christians in the body of Christ—postulated a generous interpretation of the fellowship between a Christian and a pagan marriage partner: the pagan one is saved with the Christian one “for the unbelieving husband is consecrated through his wife, and the unbelieving wife is consecrated through her husband”; even the children from such a marriage in which at least one partner belongs to the body of Christ “are holy” (1 Corinthians 7:14). If the pagan partner, however, does not want to sustain the marriage relationship with a Christian partner under any circumstances, the Christian partner should grant the spouse a divorce.

Jesus himself based his parables of the kingdom of God on the idea of love between a bride and groom and frequently used parables that describe the messianic meal as a wedding feast. In Revelation the glorious finale of salvation history is depicted as the wedding of the Lamb with the bride, as the beginning of the meal of the chosen ones with the Messiah–Son of Man (Revelation 19:9: “Blessed are those who are invited to the marriage supper of the Lamb”). The wedding character of the eucharistic meal is also expressed in the liturgy of the early church. It is deepened through the specifically Christian belief that understands the word of the creation story in Genesis “and they become one flesh” as indicative of the oneness of Christ, the head, with the congregation as his body. With this in mind the Christian demand of monogamy becomes understandable.

Christianity did not bring revolutionary social change to the position of women, but it made possible a new position in the family and congregation. In the ancient Mediterranean world, women were often held in low esteem, and this was the basis for divorce practices that put women practically at men’s complete disposal. By preaching to women and prohibiting divorce, Jesus himself did away with this low estimation of women. The decisive turning point came in connection with the understanding of Christ and of the Holy Spirit. In fulfillment of the prophecy in Joel 2:28—according to Peter in his sermon on Pentecost (Acts 2:17)—the Holy Spirit was poured out over the female disciples of Jesus, as well.

This created a complete change in the position of women in the congregation: in the synagogue the women were inactive participants in the worship service and sat veiled on the women’s side, usually separated from the rest by an opaque lattice. In the Christian congregation, however, women appeared as members with full rights, who used their charismatic gifts within the congregation. In the letters of Paul, women are mentioned as Christians of full value. Paul addresses Prisca (Priscilla) in Romans 16:3 as his fellow worker. The four daughters of Philip were active as prophets in the congregation. Pagan critics of the church, such as Porphyry (c. 234–c. 305), maintained that the church was ruled by women. During the periods of Christian persecution, women as well as men showed great courage in their suffering. The fact that they were honoured as martyrs demonstrates their well-known active roles in the congregations.

The attitude toward women in the early church, however, was ambivalent at best. Paul, on the one hand, included women in his instruction, “Do not quench the Spirit” (1 Thessalonians 5:19), but, on the other hand, carried over the rule of the synagogue into the Christian congregation that “women should keep silence in the churches” (1 Corinthians 14:34). Although women were respected for their piety and could hold the office of deaconess, they were excluded from the priesthood. In the early 21st century the Roman Catholic Church still refused to ordain women as priests.

The tendency toward asceticism

The proponents of an ascetic theology demanded exclusiveness of devotion by faithful Christians to Christ and deduced from it the demand of celibacy. This is found in arguments for the monastic life and in the Roman Catholic view of the priesthood. The radical-ascetic interpretation stands in constant tension with the positive understanding of Christian marriage. This tension has led to seemingly unsolvable conflicts and to numerous compromises in the history of Christianity.

In the light of the beginning kingdom of God, marriage was understood as an order of the passing eon, which would not exist in the approaching new age. The risen ones will “neither marry nor are given in marriage, but are like angels in heaven” (Mark 12:25). Similarly, Paul understood marriage in the light of the coming kingdom of God: “The appointed time has grown very short; from now on, let those who have wives live as though they had none…for the form of this world is passing away” (1 Corinthians 7:29–31). In view of the proximity of the kingdom of God, it was considered not worthwhile to marry, and marriage was seen to involve unnecessary troubles: “I want you to be free from anxieties” (1 Corinthians 7:32). Therefore, the unmarried, the widowers, and widows “do better” if they do not marry, if they remain single. But according to this point of view marriage was recommended to those who “cannot exercise self-control…for it is better to marry than to be aflame with passion” (1 Corinthians 7:9). With the waning of the eschatological expectation that formed the original context for the Pauline views on marriage, his writings were interpreted ascetically. While these texts have been used alone in the course of church history, however, they do not stand alone in the New Testament, which also portrays marriage feasts as joyous occasions and sexual intercourse between spouses as good and holy (Ephesians 5:25–33).

By the 3rd century various gnostic groups and the Manichaeans (members of an Iranian dualistic religion) had come to reject sex. At the council of Elvira, in 300–303 or 309, the first decrees establishing clerical celibacy were pronounced, and in the 3rd and 4th centuries prominent Christians such as Saints Anthony, Ambrose, and Jerome adopted chastity. The celibate lifestyle came to be regarded as a purer and more spiritual way of life. Gradually, celibacy came to be expected not only of ascetics and monks but also for all members of the clergy, as a function of their office.

The Reformation rejected clerical celibacy because it contravened the divine order of marriage and the family and denied the goodness of sexuality. Luther viewed marriage as not merely the legitimation of sexual fulfillment but as, above all, the context for creating a new awareness of human community through the mutuality and companionship of spouses and family. The demand that priests observe celibacy was not fully accepted in the East. The early church, and following it the Eastern Orthodox Church, decided on a compromise at the Council of Nicaea (325): the lower clergy, including the archimandrite, would be allowed to enter matrimony before receiving the higher degrees of ordination, and celibacy would be demanded of the higher clergy—i.e., bishops. This solution saved the Eastern Orthodox from a permanent fight for the demand of celibacy for all clergy, but it resulted in a grave separation of the clergy into a white (celibate) and a Black (married) clergy, which led to severe disagreements in times of crisis within Orthodoxy.

The early Christian community’s attitude to birth control was formed partly in reaction against sexual exploitation and infanticide and partly against the gnostic denigration of the material world and consequent hostility to procreation. In upholding its faith in the goodness of creation, sexuality, marriage, and family, the early church was also influenced by the prevalent Stoic philosophy, which emphasized procreation as the rational purpose in marriage.

In the 20th century the question of birth control entered a new phase with the invention and mass distribution of mechanical contraceptive devices on the one hand and through the appearance of a new attitude toward sexual questions on the other. The various Christian churches responded to this development in different ways. With a few exceptions—e.g., the Mormons—the Protestant churches accepted birth control in terms of a Christian social ethic. In contrast, the Roman Catholic Church, in the encyclical of Pius XI Casti Connubii (1930; “On Christian Marriage”) and in the encyclical of Paul VI Humanae Vitae (1968; “On Human Life”), completely rejected any kind of contraception, a position confirmed by Paul’s successors as pope in the late 20th and early 21st centuries. Modern economic and population concerns in connection with improved medical care and social and technological progress have once again confronted the Christian community with the issue of contraception.