(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. 29 May 2019. <https://www.yourdictionary.com/ben-wa-ball>.
ben-wa-ball. (n.d.). Retrieved May 29th, 2019, from https://www.yourdictionary.com/ben-wa-ball
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