From the Introduction:
According to contemporary scientific research, the human person is so profoundly affected by sexuality that it must be considered as one of the factors which give to each individual's life the principal traits that distinguish it. In fact it is from sex that the human person receives the characteristics which, on the biological, psychological and spiritual levels, make that person a man or a woman, and thereby largely condition his or her progress towards maturity and insertion into society. Hence sexual matters, as is obvious to everyone, today constitute a theme frequently and openly dealt with in books, reviews, magazines and other means of social communication.
In the present period, the corruption of morals has increased, and one of the most serious indications of this corruption is the unbridled exaltation of sex. Moreover, through the means of social communication and through public entertainment this corruption has reached the point of invading the field of education and of infecting the general mentality.
In this context certain educators, teachers and moralists have been able to contribute to a better understanding and integration into life of the values proper to each of the sexes; on the other hand there are those who have put forward concepts and modes of behavior which are contrary to the true moral exigencies of the human person. Some members of the latter group have even gone so far as to favor a licentious hedonism.
As a result, in the course of a few years, teachings, moral criteria and modes of living hitherto faithfully preserved have been very much unsettled, even among Christians. There are many people today who, being confronted with widespread opinions opposed to the teaching which they received from the Church, have come to wonder what must still hold as true.