Is it possible to get calluses on your ? (serious discussion only plz)?

Strange question, I'm aware, but me and my buddies got shitfaced on Friday night and it came up in our conversation. Anyway, my buddy Tim claimed that he got so much action that he had calluses on a his , so instead of ruining the buzz of the night by looking at my bro's junk to see if he was lying, I decided to ask the question here. It sounds preposterous, I know, but now I'm curious. So if anybody here is a medical specialist, specifically a urologist, I'd really appreciate a serious answer. If you really can get a callus on your , would it enhance pleasure for your girl? Would there be any techniques I could practice by myself to encourage callus growth and hardening? Would it decrease feeling and therefore increase ual endurance? And If it isn't possible, why isn't it? Is the skin on the that much different from the skin on your fingertips? I remember a news special a while ago about some guy who lost his in an accident and then replaced it with one of his fingers, so it should be possible, right? I'd appreciate any medically relevant answer you can provide me with, thanks. :]