For women and more rarely for anus on men, Ben Wa balls, also known as Burmese bells or Geisha balls are marble-sized metal balls. They are supposed to only prepare to a sexual relation. Used in the harems for the women vaginas to be wet for the sultan.
The Ben Wa balls, designed for a vaginal and/or anal pleasure, are composed of two or four balls, solid, or contain clappers or chimes within. They exist in different material for various sensations, in plastic, or latex or silicone. Some encasing lesser balls are called Duotone balls.
They go in the vagina, or anus, or generally one in each orifice. The movements make the balls vibrate. It's one of the rare sexual devices which can be used in nearly all circumstances (in the street, at work...).
They are also used in the postnatal period, in order to tighten the vagina again.
Each ball contain another smaller ball inside. It's chocking the larger ball when you move. The pleasure can increase very quickly. And the fact that someone can hear you if you are with people, can also extend pleasure.
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Created by AzurDev - Some texts are from Wikipédia - Version française sextoy