IV. Offenses Against the Dignity of Marriage

From The Catechism of the Catholic Church

2380
Adultery refers to marital infidelity. When two partners, of whom at least one
is married to another party, have sexual relations – even transient ones – they
commit adultery. Christ condemns even adultery of mere desire.¹⁷⁰ The
sixth commandment and the New Testament forbid adultery absolutely.¹⁷¹
The prophets denounce the gravity of adultery; they see it as an image of the
sin of idolatry.¹⁷²

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