tattoos say, look how nonconformist and daring I am...
And, IMHO, raise questions re judgment and maturity. Tattoos , body piercing, and earrings (on men) are the kind of "adornment" one expects to find among adolescents and certain pro athletes and entertainment types who for some strange reason find it necessary to exhibit a "look how nonconformist and daring I am" attitude to the world. May work in some circles but certainly not the norm in aviation. If one feels compelled to display one's "uniqueness," why not do it in a way that will be easily reversible when the day inevitably comes when one asks "What was I thinking!?"