Catechism of the Catholic Church
Paragraph 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.
No biblical citations detected in this paragraph.
No semantically close passages found in the indexed corpus.