My first one was about five years ago when my prostate started acting up. After having a cystoscopy, the urologist recommended surgery but first you get the urodynamics - a couple of nurses inserting a dual catheter to check bladder function. The feeling of that sliding through my prostate was "wow"!. couldn't wait to try that myself, been playing with them ever since. *********** with a 16fr in place is really fun, but you must be careful not to irritate the meatus. Been experimenting with sounds (dilators) working up to 28fr. As always cleanliness is paramount, no infections so far.