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An act done for [sexual gratification] or for brotherly bonding with your boys, originating in Finland (hence the name). The act involves a male going into a sauna until he is thoroughly warmed and his balls are [hanging low], before [immediately] exiting the sauna and rapidly either submerging in ice-water or lowering his testicles in the snow, only to return to the sauna and repeat. The rapid cooling from the snow/water causes the ballsack to retract, and the heat of the sauna reverses it; the up and down motion of the participant's balls resembles that of a Yo-Yo, giving the world the "Finnish Yo-Yo."
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