Catechism of the Catholic Church
2353 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.
Matthew 15:19-20
19. For out of the heart come evil intentions, murder, adultery, fornication, theft, false witness, slander.
20. These are what defile a person, but to eat with unwashed hands does not defile."
1 Cor 6:18
18. Shun fornication! Every sin that a person commits is outside the body; but the fornicator sins against the body itself.
Gal 5:19-21
19. Now the works of the flesh are obvious: fornication, impurity, licentiousness,
20. idolatry, sorcery, enmities, strife, jealousy, anger, quarrels, dissensions, factions,
21. envy, drunkenness, carousing, and things like these. I am warning you, as I warned you before: those who do such things will not inherit the kingdom of God.
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