Masturbation frequently happens when we’re running away from something uncomfortable: boredom, loneliness, an idea, a person.
The fundamentalist thinks this is sinful because there’s an omniscient being watching us, and He hates masturbation. Nonsense.
The wise know that masturbation could be interpreted as sinful because it only leads to more discontent, more loneliness.
It’s easier to run for safety than it is to see where discomfort might lead you (creativity? a different person?).