The art of shaving ones ball sac to a smooth finish. Then warming the sac in lukewarm water for 5 minutes. Taking the sac and it's contents and gently placing the sac between either left or right (dominate hand preferable) hand. Put the sac between the index and the thumb. Gently advance your hand with your balls in it until your sac is tight and gives the resemblance of a freshly plucked quail.