So I guess I’ll go to skin pain and damage first.
I’ve come to understand that any pain one feels with high pressure pumping is skin pain. Going back to the hanger analogy for a moment, the attachment point with pumping is our skin. That’s where the pressure “grips” our penis.
Anyone who has tried hand pumping up to a high pressure has probably felt a pain in the skin like they’re tempting a blister. PE4F pumping is actually totally painless. It turns out that this pain in the skin is a function of both pressure, and time at pressure. And also conditioning, and acclimation.
So first the function of time and pressure. This is simple. I may be able to do 10 seconds at full vacuum, with zero pain. But if I stay at full vacuum for a minute, it would begin to hurt the skin.
Acclimation, a term I’m using to describe the change in the pain threshold throughout any given workout. Basically, when I do a PE4F workout, I do the first 10 sets at below full vacuum, gradually increasing the pressure with each set. All the sets are 10-20 seconds long. Now, if I were to do a full vacuum set as the first set, it would hurt. But by acclimating over several sets, by the time I get there, it’s painless.
Similarly, I could do the acclimation by varying the time (but I’ve found doing it by varying pressure works better). I first do 10-20 sets of 1 second at full vacuum. Then I could do a bunch of sets at 2 seconds. And so on, up to my full 10-20 second sets. Doing it this way, one may actually feel a bit of pain in each set… but the onset of that pain comes later and later in the set. As I mentioned, I find varying the pressure for the acclimation / warm-up to work much better, and doesn’t hurt at any point along the way.
Conditioning. The skin does get conditioned to high pressures. In a broad sweeping sense, in any given combination of time and pressure, I think I am less likely to feel pain or skin damage after 2.5 years of PE4F pumping than I was back when I started.
Blistering would be the ultimate consequence of ignoring skin pain. The first feeling of blistering is a hard signal to stop for the day. There’s just no reason to tempt it. For me it starts to show up about 20-25 minutes into the workout. Up until that point, it’s painless. It just feels like a very strong pull on my unit. But no pain. The magic of PE4F pumping is being able to spend essentially half of this total workout time, so 10-12 minutes, at full vacuum pressure, without even the beginning of a blister. With normal pumping, this feeling of blistering at high pressure begins almost immediately, within the first minute. So by doing a bunch of small sets of 10-20 seconds, that blistering never starts - until much later in the workout.
Pain at the pubic bone. Thought this is something I should mention because it does matter. A velseal tube or any kind of makeshift padding will fix it. Any pain from any source kind of gets added into our threshold, so comfort at the cubic bone can make higher pressures on the skin more comfortable as well.