The teaching in plain words
Church teachingThe Catechism defines fornication as sexual union between an unmarried man and an unmarried woman, and calls it gravely contrary to the dignity of persons and of human sexuality. The Church teaches the same about a so called trial marriage, where a couple intends to marry later but begins sexual relations now. However sincere that intention, carnal union is morally legitimate only when a definitive community of life between a man and a woman has been established.
Persona Humana, a document of the Congregation for the Doctrine of the Faith, answers the most common objection directly. Many people claim a right to sexual union before marriage when there is a firm intention to marry. The Church responds that every genital act must take place within marriage, because only marriage guarantees the stable, exclusive and lifelong commitment that the act expresses.
Living together without marriage, which the Catechism calls a free union, falls under the same teaching. It offends the dignity of marriage because it refuses public, permanent form to a relationship that already includes sexual intimacy.
Fornication is carnal union between an unmarried man and an unmarried woman. 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.
Why the Church holds this line
Church teachingThe reason is not that the Church thinks sex is shameful. The same Catechism calls the acts of married love noble and honorable, a source of joy and pleasure. The teaching on premarital sex comes from taking sex seriously, not lightly.
Saint John Paul II described the body as having a language. The marriage act says, with the body, I give myself to you completely, for the rest of my life, open to all that may come from our love. Before the vows, that statement is not yet true, however much the couple loves each other. The Church asks that the body not say something the life has not yet promised. This is the heart of the Theology of the Body.
There is also a practical wisdom here. The Catechism notes that premature sexual relations are no guarantee of sincerity and fidelity. Couples who wait often find that the season of engagement becomes a time to learn communication, self-mastery and mutual respect, which are the very skills a marriage needs for decades.
| Situation | Teaching | Source |
|---|---|---|
| Intercourse between unmarried partners | Grave matter, called fornication | CCC 2353 |
| Intercourse while engaged with firm plans to marry | Still reserved for marriage | CCC 2391, Persona Humana VII |
| Living together without marriage | Offends the dignity of marriage | CCC 2390 |
| Affection proper to engagement | Good when it respects continence | CCC 2350 |
Chastity for engaged couples
Pastoral guidanceThe Catechism describes the engagement period as a time of testing that is also a discovery of mutual respect and an apprenticeship in fidelity. Engaged couples are called to live chastity in continence, reserving for marriage the expressions of affection that belong to married love, and showing each other the signs of tenderness that are proper to their stage.
In practice, many couples find these habits helpful:
- Talk about boundaries early and honestly, when you are calm, not in the middle of a tempting moment.
- Avoid situations that make it hard to keep the promise you made to each other, such as spending the night alone together.
- Pray together, even briefly, and receive the sacraments often.
- Use the time to prepare for marriage well, including learning about fertility and natural family planning before the wedding.
Formal preparation helps as well. Our guide to Catholic marriage preparation explains what parishes usually require and how to make the most of it.
Those who are engaged to marry are called to live chastity in continence. They should see in this time of testing a discovery of mutual respect, an apprenticeship in fidelity, and the hope of receiving one another from God. They should reserve for marriage the expressions of affection that belong to married love.
If you have already had sex before marriage
Pastoral guidanceMany people reading this have already had sex outside marriage, sometimes with the person they now plan to marry. The Church does not respond with contempt. The Catechism says chastity grows in stages often marked by imperfection and sin, and that a person builds himself up day by day through free decisions.
The path forward is simple and open to anyone. Go to confession, where God forgives completely. Decide together, as a couple, to live chastity from now until your wedding. If you live together, talk with your priest about the practical steps. Many couples describe this renewed commitment as one of the most meaningful parts of their engagement.
Moral responsibility also depends on knowledge, freedom and circumstances, which is why a priest judges the person and not only the act. Whatever your past, the vision of Catholic intimacy and marriage is still yours to live.
Sources
Every source below is linked to the full text on vatican.va or usccb.org. Quotations are short and given word for word.
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CCC 2353 Doctrine
Catechism of the Catholic Church 2353 (The Sixth Commandment)
Fornication is sexual union between an unmarried man and an unmarried woman. It is gravely contrary to the dignity of persons and of sexuality, which is ordered to the good of spouses and the generation and education of children.
Read the source -
CCC 2390 Doctrine
Catechism of the Catholic Church 2390 (The Sixth Commandment)
In a so-called free union a man and woman refuse to give public, juridical form to a relationship involving sexual intimacy. Such situations offend the dignity of marriage; the sexual act must take place exclusively within marriage, and outside of it is a grave sin that excludes one from sacramental communion.
Read the source -
CCC 2391 Doctrine
Catechism of the Catholic Church 2391 (The Sixth Commandment)
Some claim a right to a trial marriage when they intend to marry later. However firm that purpose, premature sexual relations are not a guarantee of sincerity and fidelity; carnal union is morally legitimate only when a definitive community of life between a man and a woman has been established.
Read the source -
CCC 2350 Doctrine
Catechism of the Catholic Church 2350 (The Sixth Commandment)
Engaged couples are called to live chastity in continence. This time of testing is a discovery of mutual respect and an apprenticeship in fidelity; they should reserve for marriage the expressions of affection that belong to married love and help each other grow in chastity.
Read the source -
CCC 2343 Doctrine
Catechism of the Catholic Church 2343 (The Sixth Commandment)
Chastity grows in stages that are often marked by imperfection and sin. A person builds himself up day by day through free decisions, knowing, loving and accomplishing moral good in stages of growth.
Read the source -
PH VII Magisterium
Congregation for the Doctrine of the Faith, Persona Humana VII (1975)
Many claim a right to sexual union before marriage when there is a firm intention to marry. This contradicts Christian teaching: every genital act must take place within marriage, because only marriage guarantees the stable, definitive union that sexual love requires.
Read the source