Masturbation is the sexual stimulation of one's own genitals for sexual arousal or other sexual pleasure, usually to the point of orgasm. Masturbation is frequent in both sexes and at any age. Various medical and psychological benefits have been attributed to a healthy attitude toward sexual activity in general and to masturbation in particular. No causal relationship is known between masturbation and any form of mental or physical disorder. Masturbation has been depicted in art since prehistoric times, and is both mentioned and discussed in very early writings. In the 18th and 19th centuries, some European theologians and physicians described it as "heinous", "deplorable", and "hideous", but during the 20th century, these taboos generally declined. There has been an increase in discussion and portrayal of masturbation in art, popular music, television, films, and literature.