--but I did try to do an Internet search for the situation, and couldn't find anything that seemd applicable. (In fact, most of what did come up seemed to fit more into the porn category than anything else, and was of dubious origin.)

It's certainly possible to injure nerves through "overstretching", which will tned to damage axonal fibers and/or fray myelin sheathing. And nerve regeneration is possible, but it tends to be very slow (such as you seem to be experiencing), and often incomplete. At the very least, sensations may be different than before, as when nerve fibers grow back, they seldom do so in the same configuration as they were originally, and the brain may take a while to determine how to interpret the sensations.

I suppose the real question, from a male perspective, is are you having functional difficulties. That may be an area in which help is possible (as witness the various erectile medications, which are often used by people with MS and other disorders of nerve function).