These Ben Wa balls from Nasstoys are the latest in a long tradition that spans back hundreds of years to Burmese Courtesans who used to wear the balls to keep themselves aroused during the day, and tone their pelvic floor muscles for greater control during sex. These Femme balls use the softest velvet-touch rubber and are completely waterproof - wear them an the bath, the sauna, at work - anywhere, for a secret satisfaction!