AFAIK everything's fine by them except facial tats, which I think is a reasonable stance. As far as piercings go, I'd imagine it would have been a relevant topic about ten years ago but I don't think heavy use of piercings is really a thing anymore
The big thought is "It's your body, you gotta live with it"
I've never gotten any truly good tattoo ideas so I'm probably never gonna get one personally, but maybe piercings at some point?