Excerpt from Spencer W. Kimball’s ‘The Miracle of Forgiveness’, Chp. 6:¹

“Youth come into contact early with masturbation. Many would-be authorities declare that it is natural and acceptable, and frequently young men I interview cite these advocates to justify their practice of it. To this we must respond that the world’s norms in many areas-drinking, smoking, and sex experience generally, to mention only a few-depart increasingly from God’s law. The Church has a different, higher norm.

Thus prophets anciently and today condemn masturbation. It induces feelings of guilt and shame. It is detrimental to spirituality. It indicates slavery to the flesh, not that mastery of it and the growth toward godhood which is the object of our mortal life. Our modern prophet has indicated that no young man should be called on a mission who is not free from this practice.

While we should not regard this weakness as the heinous sin which some other sexual practices are, it is of itself bad enough to require sincere repentance. What is more, it too often leads to grievous sin, even to that sin against nature, homosexuality. For, done in private, it evolves often into mutual masturbation–
practiced with another person of the same sex and thence into total homosexuality. “