Mmm... I honestly don't care for tattoos at all. The can be really ugly, like a mish-mash of random things on random body parts. Or rather attractive, matching tribal designs on both shoulders or something. If a guy says, "Oh, check out my tattoo!" and he shows me a huge wolf head on his shoulder, it's a big turn off. I love wolves to death but to have a make-shift image of one inked into your skin permanently? No go buddy.
Piercings... I think ear piercings on a guy is attractive, just one in each ear, guaged to a 10 or something, that's nice. Anything else I could care less for.
Don't forget, this is all just my opinion, no need to get offended if you have a huge wolf tattoo on your shoulder, as long as you like it, go for it!
Personally, I don't have any tattoos (and never will have any) and no piercings. I plan to get my ears pierced to a 11 or 10 sometime soon when I'm feeling brave enough... i'm such a chicken about it!!