Are you absolutely certain it’s your ligs that are sore, and not your tunica?
I think the physics of PE is, if not largely, then, to a great degree, assumed. I’m not asserting that these assumptions are made from ignorance or haste, I think many of them may be right or at least have merit. Still, PE hasn’t been privy to the same amount of scientific scrutiny and study as, say, Viagra. We have certain medicines that work, we don’t know why, but we have an assumption behind it. Still, the medicines work. Several aspects concerning popular hypotheses with PE may be the same way.
Whether or not the ligs can be stretched infinitely, I don’t know. Technically speaking, I think all things have a limit. We can stretch a rubber band only so far before it snaps. If it doesn’t snap, it would eventually become so thing that further lengthening would not be possible.
To make this point clearer, let’s pretend that a material has been invented that never reaches a breaking point. That is, it has no elastic limit. One strand of this material is fixed to a pole and the other is fixed to a large boat. If the boat is given a mission to circle the planet until something prevents the new material from stretching, providing that something is not unrelated to the material itself, there would come a point at which something other than stretching must occur.
Possibility 1: The string, because it has no elastic limit, cannot break; however, due to the molecular composition of the material, if it were stretched too far the particles building that material would eventually be pulled apart. Rather than breaking, some part of the material would cease to be as a result of it being pulled apart at the molecular level.
Possibility 2: A point would be reached where the material became a chain of atoms aligned in single file. By some definition, this chain of atoms may be said to still be that same material, only altered by its stretching. Still, the issue of whether or not this strand of atoms can be said to be the original material would be up for serious debate. Would this new strand of atoms hold the same qualities of the original material?
I’m sure there are other possibilities, but I’ve gotten off on a serious tangent here and I don’t want to make things worse.
Basically, I don’t see how it’s possible to have infinite possible gains from ligs. When a thing is stretched, it grows harder. When a thing is harder, it is harder to stretch. Eventually, a thing that is stretched will break or grow so thing at some point in the middle that it will break in that area. This seems to be true with everything I’ve ever seen stretched: glass (hot), metal, plastic, rubber, and even wood.
The difference between a lig in a penis and all the things I mentioned above is that our ligaments are in our body and are living tissue. The wood I saw break was no longer part of a living organisms, and did not undergo any healing process—as do things in our bodies. The question is, are our ligs repaired in a way that they are widened? If not, they could grow to a point where they are so thin that they would be too hard to stretch any further, or would grow so thin at a point somewhere in the middle that it could tear apart—possibly without notice, if it is thin enough.
Of course, none of what I’ve said above comes from medical research, it is only the mindless babble of a sleepy baboon meandering around in Thunder’s Place. ;)