Does Urethral sounding hurt?

I have been using a TENS unit for about 12 years and and recently A friend told me how good the urethral sounding is how exactly does that work the thing you put down your penis that rod is that's the thing that gives the impulses to your penis into making you have an orgasm is that right

Does it burn does it hurt I was wondering if anyone could suggest what size rod I should get at the beginning because I see they're coming all different thicknesses and if they know a good place I could get them from

How long and how wide a rod I should get if that's what you call it

It can if not done properly. The insertion of a numbing agent stings but does not hurt.

Look here as a starting point

https://www.thechaingang.com/adult-adventure/male-body-jewelry/urethral-sounds.html?limit=32&gad_source=1&gbraid=0AAAAAD_dpJm8jmiLiRcxRwjtQ7QfSD9Hw&gclid=CjwKCAjwoa2xBhACEiwA1sb1BDjI9kEQHtqYa7SGkZU6kaxJp2GM97brev1RSwXSVGPl6-Qeuo_3OBoC3oYQAvD_BwE

The proper size of the rod depends on how big your urethra and meatus (opening of your penis) Most male catheters are 16-20 'French' Diameter is roughly the number divided by 3. so 5-6-7 mm. You could go to craft store and buy some knitting needles or crochet hooks in different sizes, then stick them in to see what size will fit comfortably. Some guys like to dilate the urethra to 10 mm or more. I've been using 20 Fr a long time. I tried dilating and it hurt too much. Never got past 24, (8 mm) and not a long time at that--hurt after couple hours. I'm not into urethral pain..

Here's one thing to keep in mind. The intensity of the stimulation is inversely proportional to the surface area of the electrode. So if you pull out a sound while it's getting electricity then as it comes out the estim will get more intense. That can sting if you don't turn the box off first.

If you are not accustomed to urethral sounding you should start with small diameters sounds. Depending on the anatomy of your urethral meatus it may be a little bit painful the first time. I remember my play doctor warned me and it was for me. After that first step you will surely tolerate progressive dilatations up to the last diameters of Hegar set and be ready for the trans urethral electrical stimulation. Use a large pear shaped anal electrode secured inside the rectum. Be sure the penile electrode is inserted at least an inch deep under the glans before starting the stimulation so the urethra can irradiate electricity to all pudendal innervations. Rectal electrode should be positioned to reduce unwanted stimulation of cremasteric nerve and testicles which result in painful stimulation. The trans urethral stimulation will give you many contractions of both anal sphincter and urethral musculature. Pay attention to secure the penile electrode or it will move inside the urethra. What is unexpected first times is the loss of stimulation experienced by patients when the urethra get filled of semen during the orgasm. My play doctor usually add a couple of surface electrodes on my glans to be sure the stimulation remains intense also during the semen expulsion.