the "butt cheek" models (44xx) are unpopular in japan because rather than being associated with the "butt," the are associated with the "vagina."



these models weren't sold in japan and the japanese market got their own versions where the "butt" has been redone more to look like a "dart" on a shirt. I've been told that they don't work nearly as well though.



If you've not seen one, sometimes these japanese models come up on ebay.

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