Tattoos: Other people, okay. Sometimes it’s very sexy. Take a look at the Suicide Girls webpage for some hot tattooed chicks. On the other hand, it doesn’t make anyone who wasn’t already good looking look any better. If you’re hot, it adds an adornment, something to catch the eye and make you stand out among the other hotties. If you’re not, it just makes you look like you’re trying to attract attention. And you get the wrong kind of attention from that.
I don’t like facial tattoos unless they’re tribal, and you belong to that tribe. If you’re not Maori and you get Maori-style face patterns, you look like a pathetic wannabe. Unless, of course, you can recite traditional teaching-songs telling the story of your tattoos. You’re redeemed then, because you’ve become an honorary member, in my eyes at least.
Myself, not my style and I don’t like doing anything permanent to my body. Plus, it’s just one more identifying mark for The Man to track me with 
If I ever did get a tattoo, I’d go for one of those full-back Japanese style tattoos. No little wussy barbed-wire armlet for me. The tattoo on Yeoh in the Crying Freeman manga is pretty darn cool.
I’m a little old now to go for that kind of thing. I personally think that tattoos should be marks of a rite of passage or something similar. I wouldn’t want to get one unless it actually commemorated something personally important or was something earned. I’ve got no problems with other people getting them “just 'cuz” but that’s not for me.
Piercings: On other people, in moderation. I don’t find eyebrow, lip, cheek, chin, etc. piercings very attractive. I also don’t like septum piercings. One or two genital piercings can be kind of cool. Course, you don’t see those until you unwrap your present, but it could be fun to play with.
On me, I wouldn’t mind, but I don’t think I want to jeopardize my equipment. Man-bits seem to be complicated enough that they have multiple failure points already, I don’t want to take chances on increasing the odds of failure to achieve liftoff, if you know what I mean. Nipple piercings on men just look funny. That basically leaves me with ears, tongue, or nose as places I’d be willing to be pierced, and none of those really fits my style.
Plastic surgery: Why? My sister got her tits done. I think they look weird. I’ve never been with a plastic girl, but I doubt I’d really like it. I like natural better. I broke my nose a few years ago. I might get the bend corrected one day, but more to restore normal breathing than to get my sizable schnoz reduced. I probably wouldn’t even ask them to do more than fix the damage. There are some people who need some facial reconstruction, but other than that, I think it’s dumb.