Circumferential fibers keep the penis from bulging out when the end is being pushed in, and longitudinal fibers keep its length when it is being squeezed. The structure is designed to perform its job flawlessly. Yes, the balloon analogy will not be appropriate to illustrate the complete functioning of the penis.
The penis is a hydrostatic structure that relies on pressurized liquid for rigidity. A structure that relies on internal pressure for stiffness must have a means of restraining that pressure—a tough skin—to make sure its innards stay innards. The structure must contain a degree of flexibility, it must bend without crimping—an inability to do so could lead dangerously to a pinched blood vessel. The physiology is so robust (for a penis), that it is very difficult to influence the receptacle; instead, we must influence the inner workings (vasculature) that cause it to enlarge and become erect. My posts are more about discarding anything to do with “flaccid size” and concentrating on only erect size. There are going to be variations between individuals on what constitutes their “resting flaccid size” because there are so many factors that go into it (I mean its wired to brain centers and influenced by everything under the sun).
I use the balloon analogy to amplify the criticality of increasing volume, that for a given volume of blood or air the balloon will expand proportionately. The same balloon can take on many sizes given the amount of air in the chamber. When the balloon is deflated it assumes its original size (relatively speaking/I know deformation has occurred and it will never be the same), the flaccid penis responds similarly, it does not grow or stretch to new proportions as a result of PE (relatively speaking).
What percentage of posts deal with flaccid size on this site? It does not mean anything and from my way of thinking it (on average) changes very little. Yes, there will be exceptions; the penis is a curious fellow. Grower/shower, who cares, its about the erection—-we want a big erection. So, we optimize our existing erectile pressure by enlarging our pipes which induces a larger volume of blood and a huge erection.
Its great to have a nice bulge and you will if you optimize the circulatory system but one should not get preoccupied with something as innoucuous as “flaccid gains.” Your pretty much stuck with your flaccid appearance (most of us), so work on the part your not stuck with; a bigger boner.