Conjugal love or the friendship of spouses can persist even after sexual desires have weakened withered and disappeared.
Marriage is an act of will that signifies and involves a mutual gift which unites the spouses and binds them to their eventual souls with whom they make up a sole family - a domestic church.
Do not separate text from historical background. If you do you will have perverted and subverted the Constitution which can only end in a distorted bastardized form of illegitimate government.