OK, during a search for something else, I came across this gem of a page. To fully appreciate it, be sure to visit the other pages numbered at the bottom of this link.....(WARNING can be VERY, VERY GRAPHIC!!!!!)
http://modblog.bmezine.com/category/extreme/page/5/
Now, as a person who is both tattooed (3" triangular celtic knot on nape of neck) and pierced, (prince albert, currently 10g) I can say that I understand someone who also is pierced and/or tattooed. However, looking through the link posted above, I have to say that for me there is definitely a line that gets crossed in a spectacular way for some of these "body mods". Now, I can see someone getting an implant under their skin. I can see tongue splitting. I can even see scarification. But what I don't fully understand is metallic screw on inserts, super heavy tats, piercings the size of hubcaps, and even worse, amputation. While I certainly won't preach against them, I have to wonder what drives these modifications. But what about amputation? How is that a reasonable "body mod"?
So the question I pose is this.... What is your "line" that divides body mods from mutilation? Does such a line exist, or is it simply in the eye/mind of the person viewing them?