I don't think they are blanket sexy. A well-done tattoo can accentuate the body, as well as saying something interesting about the character of its owner. A craptastic tattoo can mar a body like a Calvin pissing sticker on a Lamborghini. Unfortunately, tattoos can also serve as status symbols-- a jackass can sell his car and get a full-back tiger design from some prominent artist and still be a jackass. Fortunately, such things are easy to determine pretty quickly.
Likewise, piercings completely depend on placement and owner. A nipple ring done with a piercing gun on a teenager can say "poser," while ear plugs on a 36 year old anthropologist can say "worldly."
It's like clothing, really, but more permanent. Just like any other bodily adornment, piercings and tattoos can say vastly different things about the people they adorn.
.....so that would be why no answer provided in your poll is appropriate for me (or a lot of people, I'm guessing).