From Nanyang Siang Pau's column " Healthy Life " on 2-10-03, It says that the best way to toughen your testicles is to employ a method called " Golden Chill ". This method has been passed down from generation to generation ( Kung Fu way), and is recognized as a most effective method. Testicles are more active/alive under low temperature. If you expose your testicles three times a day to the air outside, and at the same time, massage with your hands to promote circulation of the blood, then before sexual intercourse, soak in cold water for 5 to 10 minutes, your testicles will be toughened, and your libido will improve. Translated for your reading pleasure.

Hasheditor thought that was similar to " sitting on ice " in our hashing ritual. Perhaps hashers who have testicles and sit on ice very often could prove or disprove it.