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it is really the body's evolutionary reaction to protect dick and balls. they get closer to the body to prevent injury from the motion. it is steered by the body's own hormones when exercising.
similar thing happens in different temperature conditions: balls get closer to the body and the dick gets smaller to better protect these body parts from freezing. the skin and blood vessels contract and the "survival chances" are higher. in the sauna the contrary happens: ball sack and dick expand their skins to prevent from overheating (balls away from the relatively warm body and skin surface on dick is bigger and thus better disposal of heat).
stunning insight: i heard in the same context that black dicks (usually found in warm regions) don't need that protection mechanism like more nordic exapmples and thus are often bigger overall (remember, a bigger size prevents from overheating lol...) ... kind of logic, right?
similar thing happens in different temperature conditions: balls get closer to the body and the dick gets smaller to better protect these body parts from freezing. the skin and blood vessels contract and the "survival chances" are higher. in the sauna the contrary happens: ball sack and dick expand their skins to prevent from overheating (balls away from the relatively warm body and skin surface on dick is bigger and thus better disposal of heat).
stunning insight: i heard in the same context that black dicks (usually found in warm regions) don't need that protection mechanism like more nordic exapmples and thus are often bigger overall (remember, a bigger size prevents from overheating lol...) ... kind of logic, right?