Whether practised by females or males, masturbation – the stimulation of one's own sexual organs for pleasure with or without reaching orgasm – is condemned by Roman Catholic church as a grave moral evil, because it is not directed toward procreation. Earlier male masturbation was viewed as comparable to abortion, because it was thought that the male seed contained the whole offspring.
Masturbation particularly constitutes a very serious disorder that is illicit in itself and cannot be morally justified, although the immaturity of adolescence (which can sometimes persist after that age), psychological imbalance or habit can influence behaviour, diminishing the deliberate character of the act and bringing about a situation whereby subjectively there may not always be serious fault. Therefore, adolescents should be helped to overcome manifestations of this disorder, which often express the inner conflicts of their age and, in many cases, a selfish vision of sexuality. (Pontifical Council for the Family: The Truth and Meaning of Human Sexuality, 1995).
The traditional Catholic doctrine that masturbation constitutes a grave moral disorder is often called into doubt or expressly denied today. It is said that psychology and sociology show that it is a normal phenomenon of sexual development, especially among the young. It is stated that there is real and serious fault only in the measure that the subject deliberately indulges in solitary pleasure closed in on self ("ipsation"), because in this case the act would indeed be radically opposed to the loving communion between persons of different sex which some hold is what is principally sought in the use of the sexual faculty. This opinion is contradictory to the teaching and pastoral practice of the Catholic Church. Whatever the force of certain arguments of a biological and philosophical nature, which have sometimes been used by theologians, in fact both the Magisterium of the Church, in the course of a constant tradition, and the moral sense of the faithful have declared without hesitation that masturbation is an intrinsically and seriously disordered act. The main reason is that, whatever the motive for acting this way, the deliberate use of the sexual faculty outside normal conjugal relations essentially contradicts the finality of the faculty. For it lacks the sexual relationship called for by the moral order, namely the relationship which realizes the full sense of mutual self-giving and human procreation in the context of true love. All deliberate exercise of sexuality must be reserved to this regular relationship. Even if it cannot be proved that Scripture condemns this sin by name, the tradition of the Church has rightly understood it to be condemned in the New Testament when the latter speaks of "impurity," "unchasteness" and other vices contrary to chastity and continence. 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. 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. On the subject of masturbation modern psychology provides much valid and useful information for formulating a more equitable judgment on moral responsibility and for orienting pastoral action. Psychology helps one to see how the immaturity of adolescence (which can sometimes persist after that age), psychological imbalance or habit can influence behavior, diminishing the deliberate character of the act and bringing about a situation whereby subjectively there may not always be serious fault. But in general, the absence of serious responsibility must not be presumed; this would be to misunderstand people's moral capacity. (Sacred Congregation for the Doctrine of the Faith: Persona Humana, 1975).