Masturbation is the erotic stimulation of one's own genitals for pleasure. Description Masturbation is the self-stimulation of the sex organs, most often to the point of orgasm. Sixty to ninety percent of adolescent boys and 40 percent of girls masturbate. Although people's attitudes about masturbation differ widely, there is no evidence that masturbation is in any way physically, psychologically, or emotionally harmful. For many young people, masturbation is an opportunity for private sexual exploration before deciding to engage is sexual activity with another person. It is also considered the safest form of sex in the prevention of sexually transmitted diseases , including human immunodeficiency virus HIV.