By Lisa Bourne, LifeSiteNews - Regarding the benefit and obligation of marital relations, the Church says: "Conjugal love involves a totality, in which all the elements of the person enter -- appeal of the body and instinct, power of feeling and affectivity, aspiration of the spirit and of will. It aims at a deeply personal unity, a unity that, beyond union in one flesh, leads to forming one heart and soul; it demands indissolubility and faithfulness in definitive mutual giving; and it is open to fertility” (CCC 1643).