subject: What is a sex aid or sex toy? [print this page] Ben Wa Balls: These balls are specially designed for the women for their own use but these balls also can be used into sexual activity with a partner. Ben Wa balls is a set of two metal balls, where one ball is solid and the second one is partially filled with mercury. The solid ball is placed near cervix in vagina and the other is placed near first one. Any movement causes the mercury filled ball to hit the deeper one, spreading vibrations through the vaginal area.
