Human sexuality is God’s gift to mankind as an expression of the mutuality of spousal love. Its telos, or end, is to further the couple’s love through their children. At the moment of creation, God proclaimed His plan, explaining, “That is why a man leaves his father and mother and is united to his wife, and they become one flesh” (Gen 2:24). If “one flesh” refers to the manner in which spouses become one entity, a unity, then the sexual dimension is clearly included. From its very beginnings, the Church proclaimed the truth about sexuality—protecting it, on the one hand, from the devaluation it experienced in the sexual excess of the pagan culture, and on the other hand, from the Manichean and Gnostic views that condemn sexuality as something purely physical, below the inherent dignity of man. The Church presented the beauty and goodness of human sexuality within the bond of marriage to both pagans and Manicheans. Properly understood, sexuality unites a couple in Christian chastity and modesty.