You can certainly temporarily lose size, not just from weaker erections; tissues will contract trying to protect themselves in response to excessive PE, but it’s not permanent.
Tunica tears are a possibility from extreme clamping or erect bends and similar which could possibly result in scar tissue formation that would cause a permanent injury, but you’d have to be doing something pretty stupid unless you had a pre-disposing weakness, and that should have become apparent long before you got to the clamping etc. stage. Very occasionally we get someone who says they just did a few jelqs and they couldn’t get erect afterwards etc., but it almost always turns out they did an intense session as a newbie and felt too embarrassed to admit it; a ‘few jelqs’ are no more stressful to the penis than a decent session of sex or an enthusiastic wank, so if they really had that congenital weakness it would have shown up in their early days of masturbation.
firegoat is fully RETIRED from Thundersplace.
All injuries happen from "too much", or "too much, too soon" or "doing the exercise incorrectly".
Heat makes the difference between gaining quickly or slowly for some guys, or between gaining slowly instead of not at all for others. The ideal penis size is 7.6" BPEL x 5.6" Mid Girth. Basics.... firegoat roll How to use the Search button for best results