I had a similar condition as you. I too had the DaVinci with a Surgeon who professes to be an expert at nerve sparing techniques.
While the cath was still in I experienced several erections right after surgery. These intervals were unpredictable and I did not choose to act upon them for about 7 days after the cath was removed. I advised my Surgeon and he stated he sees this once in a while and called it a reaction to the surgery nothing more nothing less.
After feeling that I was one of the lucky ones as far as E.D. issues go I soon learned that no I was not that lucky as the next few months went by. Although I now respond pretty well to Viagra and Levitra I am not yet back where I was by any stretch of the imagination.
I would say to you that what your are experiencing is a truly great indicator of your successful surgery but you have a long way to go to completely heal in all areas. Keep walking and doing your kegels. Don't lift any thing heavy, nothing at all for as long as your Doctor says and then give it a couple of weeks just for luck. Trust me on this...
Good luck to you.
Currently 55, surgery at 54
Normal , 2004 Biospy negative - 2008 Biopsy positive (01-08-08)
10 cores, 1 positive and at 1% of that one core
PSA @ surgery 6
Bone and Ct scans negative
clinicaly Staged at T1C - Gleason 3+3 = 6
Robotic Da Vinci performed March 27th, 2008, University of Chicago.
Catheter out in 7 days normaly expected leakage
Post Pathology T2C, Gleason 7, (3+4) 10 % of both portions of prostate
Seminal vessels clear, fat tissue clear, single positve margin at apex measuring less than 1/2mm.
PSA Six week < 0.1 4 month PSA <.05 6 month PSA<0.01,9 month<0.01,12 month <.008
Watching PSA @ 6 months for 2 years, will do salvage radiation if necessary.
Fair to Good results with Viagra, side effects are bothersome at times. Tried Levetra about the same as Viagra. Tried Cialis, think I will stay with the Viagra at 50 mg. Side effects worse at 100 mg.