Female hysteria used to be treated as a commonly occurring disease (up to 25% of all females) caused by sexual deprivation or dissatisfaction. It was treated by “pelvic massage” of the genital area until “hysterical paroxysm” (now better known as orgasm) by a doctor or midwife. So the vibrator was originally designed as a medical device which was sold before many other electric appliances such as the vacuum cleaner and the iron. So the urban myth of a sexually dissatisfied female expressing certain emotional traits was actually believed as medical fact for thousands of years (at least 350BC to 1900).