Sociological surveys are able to show the frequency of this disorder according to the places, populations or circumstances studied. In this way facts are discovered, but facts do not constitute a criterion for judging the moral value of human acts.[²¹] The frequency of the phenomenon in question is certainly to be linked with man's innate weakness following original sin; but it is also to be linked with the loss of a sense of God, with the corruption of morals engendered by the commercialization of vice, with the unrestrained licentiousness of so many public entertainments and publications, as well as with the neglect of modesty, which is the guardian of chastity.