Ben Wa Balls (Duo Balls, Geisha Balls)
Duo balls are also referred to as ben wa balls, Burmese bells, geisha balls or orgasm balls and they are designed to roll around inside the vagina. Their insertion and removal can be an act of teasing or stimulation in itself. They also have uses outside of sex, for example as a medical aid to tighten the vaginal muscles (which in turn increases pleasure during sex).
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