The long and unbelievable history of the vibrator -- starting with its Victorian-era use as a medical remedy for "hysteria" -- is explored in this fascinating documentary based on historian Rachel P. Maines's book. Chronicling the device through its emergence in adult films of the 1920s, its resurgence at the height of the feminist movement in the 1970s and more, the film features insightful commentary from sex experts, historians and feminists.