What is the difference between circumcision and tattooing/piercing/body modification?

All the above originate in ceremonial/religious practices that were used to show tribe affiliation/status, Why do you see them as different (if you do that is)? I ask because I see no fundamental difference except maybe that one is involuntary and the others are voluntary. For some folks they are completely... show more All the above originate in ceremonial/religious practices that were used to show tribe affiliation/status, Why do you see them as different (if you do that is)? I ask because I see no fundamental difference except maybe that one is involuntary and the others are voluntary. For some folks they are completely different and I don't understand why.
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