when you work out? mine often do. am i the only one? Also they shrink when i have to poop as well. Are these normal reactions?
why does this happen?
the (balls) don't shrink...the sac tightenes up and the balls retract.....am I right? :-S
hmmm, i will have to take notice and see. I do know a buddy whose balls seem to shrink and get hard as marbles just before he has orgasm.
I'll take a guess and say it has something to do with Epinephrine - Wikipedia, the free encyclopedia
During work out, the body kind of mimics the flight or fight response and constricts the "unnecessary" blood vessels (when in a life or death situation the penis / testicles aren't exactly essential) so you have more blood flow to your muscles directly responsible for saving your life
This is pretty much what I always assumed.
The body is pushing a lot of blood in to the muscle group you're working at the expense of other parts of the body.
sorry to get gross but most of you have ignored the second part of my question, does it shrivel up when you have to poop? mine does then once i poop it goes back to normal
Honestly, it sounds like the hygienic thing for them to do. Get out of the way when poop's coming. Avoid any splash-back.