(plural Ben Wa balls)
As Ben Wa balls come in pairs, the term is normally used in plural.
"ben-wa-ball." YourDictionary, n.d. Web. 11 October 2018. <http://www.yourdictionary.com/ben-wa-ball>.
ben-wa-ball. (n.d.). Retrieved October 11th, 2018, from http://www.yourdictionary.com/ben-wa-ball
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