Abrading the urethra haddens even with lots of lube everything done correctly. That causes the burning most people have with the first one or two urinations. I also think this is why some people report that the first orgasm after feels so good. They like that mild discomfort associated with the orgasm and think it heightens the sensation.

You probably know, but for others reading this - if you don't have an orgasm after sounding, at least drinks lots of water to stimulate urination and flush the area out. It's always a good idea to push all that stuff we pushed in back out.