Marriage is a covenant of love between a man and a woman which is expressed by each one surrendering their own life, and offering it to the other to form a common life (Matthew 19:5-6). Since life is physiological, the only way they can unite their lives is by uniting their physiologies. Among all the physiologies we have, the only physiology in which two human beings can unite is in reproductive physiology. Since union of reproductive physiology is only possible between a man and a woman, marriage is only possible between a man and a woman. Furthermore, since conjugal union is reproductive in nature, willingness to freely accept children is the hallmark of marriage and marital love. Furthermore, to put barriers to reproduction by contraception is to go against the very nature of the act and their marriage covenant. Furthermore, since conception is the fruit of marital love expressed through unitive love, artificial insemination, in-vitro fertilization and cloning procedures dehumanize human reproduction by taking the act of unitive love out of it and converting it into a purely cellular process. This devalues the understanding of unitive love in marriage, thereby devaluing the meaning of marriage itself. This causes grave hurt to the institution of marriage which is the very foundation of society.