i do slammers everyday and can only do about 5 before my penis goes red/limp/sore, but for the last one i hold at the base with my right hand and masterbate with my left, difference being i actually reach orgasm - when this happens grip really tight with the right hand. your pc muscle will flex uncontrollably (because of orgasm
), you can feel real surges of blood pump up, allow these surges of blood into penis but still hold tight with right hand. this is like a slammer on steroids - 120% erection easy!! im always sore after that one .