In general, the medical community considers masturbation to be a natural and harmless expression of sexuality for both men and women. It may cause distress if it is done compulsively or interferes with daily life and activities.

Masturbation is only considered a problem when it inhibits sexual activity with a partner, is done in public, or causes significant distress to the person. It is a good way to experience sexual pleasure and can be done throughout life. While it once was regarded as a perversion and a sign of a mental problem, masturbation now is regarded as a normal, healthy sexual activity that is pleasant, fulfilling, acceptable, and safe. When sexual dysfunction is present in an adult, masturbation may be prescribed by a sex therapist to allow a person to experience an orgasm (often in women) or to delay its arrival (often in men). It also is necessary when a man must give a semen sample for infertility testing or for sperm donation. Masturbation also is a safe sexual alternative for people who wish to avoid pregnancy and the dangers of sexually transmitted diseases. In addition to feeling good, masturbation is a good way of relieving the sexual tension that can build up over time, especially for people without partners or whose partners are not willing or available for sex.

Most people continue to masturbate in adulthood, and many do so throughout their lives. In young children, masturbation is a normal part of the growing child's exploration of their body. Masturbation is the first sexual act experienced by most males and females. In one national study, 95% of males and 89% of females reported that they have masturbated. Masturbation is a very common behavior, even among people who have a sex partner. Some women also use stimulation of the vagina to masturbate or use 'sex toys,' such as a vibrator. It is commonly done by touching, stroking, or massaging the penis or clitoris until an orgasm is achieved. Masturbation is the self-stimulation of the genitals to achieve sexual arousal and pleasure, usually to the point of orgasm (sexual climax).

Undertale sex masturbation