Where was the origin of tongue ring?

Well tongue piercing has various origins in many cultures, some factual and others just BS. In north American culture the tongue piercing originated in the BDSM and S&M world and was a submissive act dating back to the early 70's or later. Now tongue piercing is more a fashion statement than an actual sexual addition. Just for information it is a tongue piercing not a tongue ring, "rings" are never used due to there painful nature and awkwardness in eating, drinking, swallowing, etc. Some times there will be photos displayed with a ring in a tongue, but this is just for the photo and a ring is never left in the piercing.