Ben Wa balls, also known as Burmese bells, Orgasm balls, rin-no-tama, Venus balls or Geisha balls (Chinese: 阴道球; pinyin: yīndàoqiú "vagina ball", or Chinese: 内用球; pinyin: nèiyòngqiú "internal-use ball"), are small, marble-sized balls, usually hollow and containing a small weight, that roll around and are used for sexual stimulation (by insertion into the vagina). 
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