Is it true?
 

I heard if you put a tennis ball under your armpit while jerkin it your arm will go numb.. does that shit work?

Could be that it cuts off the blood circulation to your arm.

just putting a tenis ball under your arm and holding it there your arm will go numb.

For kicks when I was in the hospital I would press my thumb or put a small item there right before they took my pulse. Was kind of funny watching them try to find it and they couldnt.

well im sure it would go numb even if you were jerking off

wear red nail polish on your jerking hand, then watch it work in the mirror
*amazing*

i've never tried that lol

I never tried that... why would I?

Only when I put lipstick on my hand and call it Betty