A Topic of Moral Theology
Companionate and Trial Marriage
Temporary, experimental and companionate unions counterfeiting marriage, condemned by Casti Connubii.
The works themselves ask 2 questions under this heading — see them together with their answers.
In the manuals
What Is Marriage? A Catechism Arranged According to the Encyclical “Casti Connubii” of Pope Pius XI
Vermeersch, What Is Marriage?, Part Two: The Attack on Marriage, nn. 85 & 86 (2 passages — hover a number to read it)
Treated under the broader heading Matrimony — Noldin, Summa of Moral Theology · Slater, Manual of Moral Theology · Wouters, Manual of Moral Theology · McHugh–Callan, Moral Theology · Bucceroni, Moral Enchiridion · Bucceroni, Institutions of Moral Theology · Bucceroni, Moral Enchiridion (4th ed., 1905) · Bucceroni, Cases of Conscience · Gury-Ballerini, Compendium of Moral Theology (8th ed., 1884) · Tanquerey · Koch–Preuss · Vermeersch, On Chastity · Vermeersch, Theologia Moralis · Prümmer, Manuale Theologiae Moralis and 11 more — these works do not divide the matter as finely as we do here, so their treatment stands one heading up (ed.)