I don't currently have any, but I want to. An artist I know who is a good friend of mine is currently in the process of designing a tattoo for me that I'm eventually gonna put on my right arm (he's done 3 drafts, all with only very minor changes, so hopefully I'll be inked within the next few months if I have the money for it). And once I have this one done, I'll think about getting more. I have a few ideas in my head for what I might want in the future. I don't want to get too ahead of myself though, so I'm only focusing on one for now.
As for piercings, I don't have any of those either, but I've been considering it for a good while. I wore fake earrings once, just to see how it would look, and I actually ended up liking the look quite a bit. Whether or not that means I'll actually get my ears pierced, I don't know. I'd like to at some point, but I'm not sure it's really me. I've also thought about getting an eyebrow piercing, because I've always liked the way they look on people, but I don't think it'd suit me. And I don't wanna spend the money to get it done and then find that I don't like it.
As a sidenote, my friend once jokingly told me that there is a certain body part, exclusive to men, and not even all men, that I should get pierced. I told him to go **** himself lol. I've heard of people doing that before and I honestly think it's absolutely ridiculous. But hey, to each their own, people can do what they want.