Just like tattoos, make up, haircuts.... It falls under body modification. Believe it or not trimming your nails and shaving falls under this too. Its just a way of expressing yourself. Hopefully the rings that stretch the neck doesn't become popular here in the statesI never could understand why Gauges became popular in the first place. I may be getting old, but I find them kinda creepy.
No offense. I understand everyone has a right to their own self expression. I certainly don't judge anyone for their appearance, I just can't seem to comprehend the fashion statement.