Masturbation. My religion's take on it is fairly clear if you use the
Catechism of the Catholic Church as a clear, blueprint for doctrine. If you take the Catholic tradition as a whole, rather than just this book, less so. Masturbation isn't mentioned in the Bible (well it is mentioned but not in a condemnatory way unless you heavily spin Onan), nor even in Sacred (extra-canonical) Tradition. In fact, the only clear teaching against it is from medieval theologians and the modern Catechism. I don't quite understand the reasons for this. Its definitely the most questionable Catholic sexual "sin" on numerous grounds.
Even the Catechism, which in a sense strongly condemns it, is also strangely moderate. It teaches that it is to be expected in young people who are in the process of discovering their sexual urges, for example in puberty and later adolescence. It also says that "culpability" (for self-pleasuring in this way with what has a fertility function) is lessened or even annulled if masturbation has become a habit upon which the person relies:
2352 By
masturbation is to be understood the deliberate stimulation of the genital organs in order to derive sexual pleasure. "Both the Magisterium of the Church, in the course of a constant tradition, and the moral sense of the faithful have been in no doubt and have firmly maintained that masturbation is an intrinsically and gravely disordered action."138 "The deliberate use of the sexual faculty, for whatever reason, outside of marriage is essentially contrary to its purpose." For here sexual pleasure is sought outside of "the sexual relationship which is demanded by the moral order and in which the total meaning of mutual self-giving and human procreation in the context of true love is achieved."139
To form an equitable judgment about the subjects' moral responsibility and to guide pastoral action, one must take into account the affective immaturity, force of acquired habit, conditions of anxiety or other psychological or social factors that lessen, if not even reduce to a minimum, moral culpability.
So in other words, it starts by strongly condemning masturbation but then ends by essentially saying, "go light on the masturbators". If your young (affective immaturity), caught in a habit (force of acquired habit), or suffering from depression or severe stress (conditions of anxiety or other psychological) or even have a social reason for masturbating (uh, how infinite in possibilities might that be?) then your "culpability" is "reduced" - in other words a polite way of saying, "your not sinning". It then gives the whole topic over to "pastoral action", that is receiving guidance on it from your priest or pastor which might include, depending on the person, a very liberal take on their masturbation practice or a harder one. For example, if the person relies on masturbation and would be severely depressed without it, this individual would not be told to "stop" doing it instantly but rather have a more gradual evolution.
The quotation about it being a "constant tradition" isn't actually accurate. The Catechism is a "sure norm" but not everything in it is doctrine unless it reference an authoritative document. The reference for that quote is a CDF document from the 1970s. There are no references from the Bible, Sacred Tradition or anything canonical in that way - clear because Divine Revelation (for some inexplicable reason) says nothing about masturbation.
The prudential judgement of the church is clear, and therefore not to be dismissed offhand by Catholics, however in fact its rather confusing.
So I'm conflicted as to what my "religion" says on masturbation. If you go by the Catechism, its clear enough. If not, then its "chequered" with nothing in the deposit of faith
explicitly condemning it but without any approval either and certainly with the prudential judgement of the church as a whole being that it is immoral.
Certainly, monks, nuns, clergy and anyone under a vow of celibacy should not be masturbating. This would also be, presumably, the goal to be emulated - the ideal (not sexual renunciation, rather I mean refraining from self-pleasuring).
I think it would be very difficult to masturbate without lust. Most people need to imagine an erotic image of a person to turn themselves on.
However given the broad category that could "reduce culpability" for wanting to self-pleasure yourself, I struggle to think when it truly would be a sin for the vast majority of individuals.