IV. Offenses Against the Dignity of Marriage

From The Catechism of the Catholic Church

The
expression covers a number of different situations: concubinage, rejection of
marriage as such, or inability to make long-term commitments.¹⁸² All
these situations offend against the dignity of marriage; they destroy the very
idea of the family; they weaken the sense of fidelity. They are contrary to the
moral law. the sexual act must take place exclusively within marriage. Outside
of marriage it always constitutes a grave sin and excludes one from sacramental
communion.

PART THREE: LIFE IN CHRIST

SECTION TWO THE TEN COMMANDMENTS
- CHAPTER TWO YOU SHALL LOVE YOUR NEIGHBOR AS YOURSELF
  - Article 6 THE SIXTH COMMANDMENT
    - IV. Offenses Against the Dignity of Marriage

From The Catechism of the Catholic Church – rosary.team