I had a spinal cord injury.  When I came into St Joseph Hospital my survival score was 1 (1 low 300 high). I had a bladder scan of over 2 liters.  I had emergency surgery on my lowest 5 spinal vertebrae.  I had to use a In Out Catheter for about a year.  I used a 17 french plastic catheter.  17 inch is nearly the longest urethra.   It was rough.  BTW I did pass kidney stones.  By the time I went for medical help I already passed them.  Be aware of infection when you have stones, catheter, or a hospital stay.  
  Without bladder control or ability to have a full erection, a full orgasm, i learned a lot about my sexuality.  Viagra, prostate massage, anal use of toys became a lot of my release.  I learned about retarded orgasm, retraining my sexuality sensation wise, and rehab of all sorts including sexual.