I like piercings as long as they aren't too excessive. Generally, I don't think more than 2 facial piercings looks good, but I do think ears look good heavily pierced (but no gauges).
I have a tattoo myself and I'm definitely getting at least one more, so obviously I like tattoos. That said, they only turn me on if it's something original, creative, and nicely done. Very common ones like dream catchers, infinity signs, generic quotes, etc don't turn me off if they're well done, but they don't turn me on either. Poorly done tattoos are a huge turnoff as they are indicators of a lack of judgement skills. I wouldn't want to date someone that didn't take the time to do a little research into the artist that would be permanently marking their body.
In general, I find people with piercings/tattoos as a big part of their life tend to be more open-minded and less judgmental. Plus, tattoos are a great repellent for the types of people I wouldn't want to be in my life (like several of the guys who answered this).
Depends on the actual piercings and tattoos, some look amazing and some look garbage... I mean I like girls with sleeves, nipple piercings and a few facial piercings but I dislike girls with typical hipster tattoos on their wrists or feet with 10 piercings in her ear. But that's just my personal issues.
Voted turn off only because there wasn't an indifferent option. I have a bunch of piercings and want tattoos, so I'm definitely not turned off by piercings or tattoos (when I say piercings I mean more taboo/extreme things like stretched ears/noses or labia piercings).
I have 14 piercings: 8 in my ears, Septum, Lip, Nipple, Penis, Pubic area, Testicles.