The Evil of Masturbation

C.S. Lewis basically utilizes a concept taken from Augustine called incurveitis. This is a term that was used during the Reformation, and it means this, to collapse inward. So love that's supposed to be extended to others turns inward, and then we collapse into selfishness. "The real evil of masturbation would be that it takes an appetite which, in lawful use, leads the individual out of himself"