It is based on a word from Jesus. So they are no longer two but one flesh. Jesus describes one man leaving his family of origin, one woman, and the joining of the two into one flesh by God. The Church understands this to mean that sexual relations are reserved exclusively for the marriage covenant. Here it must be noted that, in the area of sexuality, as in other areas of human life, we all stand in need of God's forgiveness and restoration.
Sexuality is a highly complex and volatile part of human existence.
Created and given by God, human sexuality is good, but it is often endangered by sin, by lust, by the drive toward self-satisfaction. Therefore, all of us enter this discussion as sinners in real need of God's constantly forgiving and restoring love. The Church's teaching on homosexual practice is a part of this larger teaching on sexuality. Although we do not condone the practice of homosexuality and consider this practice incompatible with Christian teaching, we affirm that God's grace is available to all. This is a trustworthy, brief summary of the will of God for the Church.