I know a dozen threads exists about this and I’m opening this one despite gut protests about the wisdom of this, but this one has a different aim.
Both of the confessors that I’ve been to have reassured me after a confession, that because I’ve built up a severe habit of addiction over more than a decade, that I’ve sought every natural available and supernatural aid I can move myself to, then because I am struggling its plausible that its not a mortal sin.
This is based on one of the conditions of a mortal sin which is it not being fully deliberate action. If its done out of addiction, its not.
So I got curious for the basis of this, and started investigating the catechism. The relevant portion is from:
2352: …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 I wondered what the basis of this philosophy was, so I looked it up in Humana Persona, but then I got that this was based on modern psychology, and not on moral philosophy.
That got me worried, so I checked back to St Thomas Aquinas Summa Theologica. Sure enough he had the same three conditions: grave, with full knowledge and fully deliberate. However then check his teachings of Second Part Question 77 Article 8:
Article 8. Whether a sin committed through passion can be mortal?
I answer that, Mortal sin, as stated above (Question 72, Article 5), consists in turning away from our last end which is God, which aversion pertains to the deliberating reason, whose function it is also to direct towards the end. Therefore that which is contrary to the last end can happen not to be a mortal sin, only when the deliberating reason is unable to come to the rescue, which is the case in sudden movements. Now when anyone proceeds from passion to a sinful act, or to a deliberate consent, this does not happen suddenly: and so the deliberating reason can come to the rescue here, since it can drive the passion away, or at least prevent it from having its effect, as stated above: wherefore if it does not come to the rescue, there is a mortal sin; and it is thus, as we see, that many murders and adulteries are committed through passion.
So basically, unless I wake up masturbating and can’t stop myself before I reach climax, or I have sudden and involuntary ejaculation, masturbation is mortal sin, ever time. Contrary to the catechism which doesn’t explain its basis.