It only makes sense that the penis will shorten after surgery. They took out a walnut size section of our urethra above the penis and below the bladder, and that difference has to be made up somehow. Doctors hope to pull the bladder down to reconnect to the remaining urethra, but bodies don't always flex like doctors hope. So most likely the bladder comes down a little, but the penis withdraws up a little and we are left with a shorter penis. Mine certainly is, and the extra foreskin proves it. As for penile rehab, I use a VED every day to keep my penis as blood rich, and as stretched as possible.