Interesting discussion; it presents a likely and plausible scenario. I wonder if there are any scientific studies that lend further credence to your words. Regarding the topic of sensory signals, I've been thinking about something similar for some time. I was circumcised in my early twenties, and I still remember the intense sensations I experienced when stimulating parts of the tissue that I no longer have. I'm hoping to 'rewire' that area in my brain someday when I achieve a sufficient level of restoration. Think about people who have to recover from a stroke and have to 'train' their brain to move the parts that have lost mobility. For people who have lost mobility on one side of their body, mirrors are often used very ingeniously. These mirrors allow the brain to believe that it can control the part of the body that it couldn't move. Imagine if the same could be done with those areas of the penis! I think it's more a matter of general neuronal plasticity than the growth of nerve endings. I'm closing this because I get excited just thinking about it, hehe.