These people are part of bondage and fetish groups. I saw someone getting this done at a tattoo shop I was at. I asked why, and she asked why I was getting a tattoo, I said because it’s artistic and nice looking, she said that’s how I feel about this. The conversation went nowhere. Also she was a cutter, I think it gives a euphoric rush from the endorphins released to help with the pain, similar to why people cut themselves. Also people like the attention, most have Daddy problems.