The Skinship reference article from the English Wikipedia on 24-Apr-2004
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Skinship

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Skinship is an English word coined in the 1940s by the Japanese, initially to describe the closeness between a mother and her child due to the physical contact of their naked skin. Contemporary use of the word includes the close relationship that develops between friends or coworkers when they share their nakedness at an onsen or sento, stripping away the social construct that would otherwise differentiate them as boss and employee or senior and junior.