The Catholic Church continues to teach that sexual love between a man and woman is reserved to marriage. Before the man and woman come together as husband and wife, and before they express their love as husband and wife, they are first blessed by God. This marital love signifies the vows freely exchanged between each other and thereby reflects the faithful, permanent, exclusive, and self-giving love they have promised to each other and to God. Thus they are no longer two but one flesh.
The Teaching Hasn’t Changed: Premarital Sex Is Still a Mortal Sin
What does the Church teach about premarital sex? - Catholic Straight Answers
Is sex before marriage a venial sin or mortal sin? Questions about sex and Catholicism are very popular. The Catholic Church has firm requirements concerning sex to help people. However, sex used without a solid foundation like marriage is doomed with heartache. Roman Catholicism teaches that sex before marriage is a mortal sin.
Why does the Church teach that having sex before marriage is wrong? Our Church believes that sex is a wonderful thing. In the Old Testament, the book Song of Songs features wonderful poetry about the beauty of human sexuality. More recently, Pope St. John Paul II gave many lectures about the beautiful Biblical view of sexuality in his Theology in the Body also recommended is his classic book Love and Responsibility.
I have a friend who will not believe that sex before marriage is a mortal sin. Is there anywhere in Church doctrine that specifically spells out that it is? It is gravely contrary to the dignity of persons and of human sexuality which is naturally ordered to the good of spouses and the generation and education of children. Moreover, it is a grave scandal when there is corruption of the young. Matthew