From my original post:
"My reasons are personal and no one's business but my own."
I also elaborated that sometimes, modifications are visible and other times they are not. Over my education, training, and career, I've had to move to multiple geographic locations for training and opportunities to further my career (I'm 43, just FYI). Each time, I've found a generally similar dynamic, which is to say that I eventually find out that probably more than 50% of people I work with/spend time with have some type of body modification.
For whatever it's worth, I've never gotten a tattoo or piercing with someone, or on a whim, or impulsively. Also for whatever it's worth, I'm considering adding another tattoo; I've been considering this particular tattoo for the past 8 years.
OK, so despite your proclaimed intelligence, you are unable to clarify your reasoning process. Which is curious, because most rational, intelligent people are capable of explaining their actions.