I have never had a huge desire to get a tattoo, but I know if I ever did get one, it would be located on a very concealed part of my body. But then time, age, and body changes might also make them a little less appealing down the road. Belly button tattoos become angry faces; a motorcycle on your thigh becomes a minivan 20 years later; angel wings become hockey shoulder pads, and the lists goes on. I once saw a woman with a computer mouse connected to an Apple computer covering her entire shoulder.
Definitely take a moment to think about placement first...