It might be asked how a law can be contrary to the common good if it does not impose any particular kind of behaviour, but simply gives legal recognition to a de facto reality which does not seem to cause injustice to anyone. In this area, one needs first to reflect on the difference between homosexual behaviour as a private phenomenon and the same behaviour as a relationship in society, foreseen and approved by the law, to the point where it becomes one of the institutions in the legal structure. This second phenomenon is not only more serious, but also assumes a more wide-reaching and profound influence, and would result in changes to the entire organization of society, contrary to the common good. Civil laws are structuring principles of man’s life in society, for good or for ill. They “play a very important and sometimes decisive role in influencing patterns of thought and behaviour”