This article is from the Piercing FAQ, by Anne Greenblatt with numerous contributions by others.
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 <http://www.safepiercing.org>
Michaela Grey writes:
"[This piercing] forces a ring into the tiny, extremely sensitive
female urethra and out through the hymen. As women 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."
 
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