Another relatively new and experimental piercing documented in Issue #19 of Piercing World Magazine. The safety, not to mention viability, of this piercing has been questioned by a number of experienced piercers in the US.
In her "Editorial" in the Association of Professional Piercers Newsletter "The Point", Vol.1, No. 5, Michaela Grey writes:
[This piercing] forces a ring into the tiny, extremely sensitive female urethra and out through the hymen. As women are NOT men, and do not have a man's large, relatively exposed urethra, the area is not sturdy enough to withstand minor infections or the weight and friction of a ring. The female urinary tract is less than 2 inches long. An infection of the piercing could travel rapidly to the bladder and become quite serious. The piercing would not only be very uncomfortable but extremely dangerous.