When I got mine done the piercer asked me which I wanted done first. I said I don't know. She asked which hand I was dominate in (my right), so she said she'd do the right one first. Because supposedly, whichever is your dominate side is supposed to hurt more. Well in my case that wasn't true. My right one (which was th first one done) was nothing, it hurt, but it was maybe like a 3 on a 1-10 scale. The left one on the other hand, I jumped with that sucker. When I jumped I actually went to grab her elbow - she was leaning over me - of the arm that was pushing the needle through my nipple.lol. Not a smart idea.lol It was probably around an 8 or 9. That sucker HURT.
That said, this was my first time actually sitting through two piercings in one shot. Therefore, I can't really compare it to others in regards to whether or not the second one always hurts. I would likely blame it/ or chalk it up to adrenaline. After the first one your adrenaline has already jumped or in the process of jumping. You don't necessarily have that rush to cover the 'pain' so to speak. Whether that is true or not I have no idea. It could just be that you know what to expect, or think you do, and the next one is just more painful. It could also just be a difference in the level of sensitivity that each nipple has. That being that one is more sensitive than the other.
As corny as it sounds, I really wouldn't worry about it. Granted I was kind of freaking for the week beforehand. These were the one piercing that really scared me pain wise. I made it out ok - although according to my brother (he took me to get them done) I was white as a ghost afterwards.lol - and am happy with them. The pain is worth it. Best of luck and happy piercing.
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~Don't Judge What You Don't Understand!~
!The story opens on these mysterious explosions. Nobody knows what's causing them, but it's upsetting all the buffalo. So, the military are called in to solve the mystery!