The full Catholic teaching on masturbation seems to be a secret to most people. It is a challenging teaching. But because this teaching calls us to live in a fully.
The Roman Catholic Church's official condemnation on masturbation for example : Pope Leo IX's Ad splendidum nitentis.
DIFFICULT MORAL QUESTIONS: It's clear that masturbation is a grave sin of the Catholic Church (CCC) has this to say about masturbation.