Masturbation is sexual stimulation by oneself. Most people, both men and women, masturbate, especially during adolescence and at times of their lives when they do not have a sexual partner. Men masturbate by rubbing the penis or otherwise stimulating this organ. In women, a dildo (artificial penis) or finger is inserted in the vagina, or the clitoris is stimulated.
Some religions have frowned on the practice of masturbation and insisted on their adherents regarding it as sinful. Dire threats have sometimes been made that unpleasant physical consequences such as blindness will result. This is nonsense. Masturbation is harmless, and if it provides pleasure and sexual relief it is quite reasonable to engage in it.