Urethral sounding is a sexual practice that involves inserting small, smooth rods or toys into the urethra for pleasure. The urethra is the tube that runs through the penis and allows urine to pass from the bladder to the outside of the body. While urethral sounding can be a pleasurable and erotic experience for some people, it is important to use caution and proper hygiene to avoid injury or infection. If you are interested in trying urethral sounding, be sure to start with a small toy and use plenty of lubrication to reduce discomfort.