Masturbation is common and generally accepted in Western society as a normal, healthy activity. In contrast, the Catholic Church holds that masturbation is immoral. Noting that the human person is a profound unity of body and spirit, if the Church is correct, masturbation should have negative effects on the human person. If the secular view is correct, masturbation should have conversely positive effects. This paper is divided into three parts. An in-depth literature survey was performed to evaluate the physical, medical, psychological, sociological and spiritual correlates of masturbation. The second part is a theological summary of the Catholic understanding of masturbation. The third part is an approach to therapy. Physically, masturbation was found to be less sexually satisfying than intercourse. Medical complications include penile injury and self-asphyxial behavior. Psychologically, masturbation was found to be associated with depression, anxiety, immature defenses, hypersexuality, guilt, poor body self-image and stress in the workplace. Sociologically most studies indicate a negative correlation between masturbation and relationship satisfaction, quality, intimacy, relational happiness, emotional satisfaction with the partner, trust, passion, and love. Spiritually, masturbation is highly positively correlated with pornography consumption and negatively with religion and religiosity. There is a higher rate of masturbation in homosexuals and bisexuals than in heterosexuals. Theologically, masturbation and pornography directly violate the religious virtue of chastity, undermining one's prayer life and the motivation to develop a spiritual life. Therapeutically, positive psychology, which emphasizes cultivating what it identifies as virtues, including justice, courage, temperance, wisdom (similar to prudence), transcendence (similar to hope) and humanity (similar to charity), can be used to counsel individuals struggling with masturbation. Once the harms are understood, a person can be counseled that this temptation represents a challenge, an opportunity to build self-control, and with self-control the capacity to develop character strengths and major virtues.