While, it seems to have worked! I ended up going back to a 25G needle in the end, and this seems to have been key - harder to get through the flesh, but less bendy and more able to stay on target. I targeted nerves all along the dorsal branches and injected pure dehydrated alcohol. Currently I estimate my sensitivity around 5% of what it used to be. This is awesome - I can get erect purely from a fantasy, so autonomic arousal appears to be working correctly, but manual stimulation produces nearly zero results. I have almost no feeling in the glans at all, yet I still feel the erection as a sense of fullness, which is exactly what I was hoping for. I have not tried to orgasm yet. I think it will still be possible, but quite likely different now. I'm actually thinking I want to go further and target some of the ventral nerves as well - I would love to kill the sensation inside the urethra itself and actually totally block the ejaculatory reflex. In any case, I am very happy with the results but going to take a break before going any further. I think I've also proved to myself that even with the penis 100% gone I would still be orgasmic, just the only way I would have to achieve that is from a fantasy or from pleasuring my wife - which is also exactly what we both would want.