What would Ann Landers say?
“Masturbation is an intrinsically and gravely disordered action. The deliberate use of the sexual faculty, for whatever reason, outside of marriage is essentially contrary to its purpose.” Catechism, 2352
“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 be radically opposed to the loving communion between persons of different sex which some hold is what is principally sought in the use of sexual faculty.
"This opinion is contradictory to the teaching and pastoral practice of the Catholic Church. Whatever the force or 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 and intrinsically and seriously disordered act.
The main reason is that, whatever the motive for acting in 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.
"In the pastoral ministry, in order to form an adequate judgment in concrete cases, the habitual behavior of people will be considered in its totality, not only with regard to the individual’s practice of charity and of justice but also with regard to the individual’s care in observing the particular precepts of chastity. In particular, one will have to examine whether the individual is using the necessary means, both natural and supernatural, which Christian asceticism from its long experience recommends for overcoming the passions and progressing in virtue.” Sacred Congregation for the Doctrine of the Faith, Declaration on Sexual Ethics (1976), 9-10.