I don't think that I can make a general statement about the entire category or women. However, I'll say that I find redheads completely hit-or-miss. I either find them insanely hot, or rather unattractive.
Wife\GF, sure. The other's no. Not quite my thing.
Turn off? Not at all. I've found that there's practically nothing sexier than the expression on a woman's face when she's about to orgasm from me going down on her.
It's all about the attitude. If a girl is confident enough to get into one, she's hot enough to get me excited. But in general, they are a pretty attractive piece of clothing
Foreplay 90%. There are those moments when you're both so ready to go that you just need to rip off some clothes and do it.
I think the concept is hot, but i've never been with a girl who had one, so I cannot say for sure.
As long as it's clean and neat, it doesn't matter. Do what you think is sexy and be confident.
I'm a fan of tattoos, as long as they're interesting or tasteful. I've seen some nasty ones. As for piercings, go for it. Not a big fan of gauges though.
Face, not so much. Boobs, yes. Can't really explain why, it's just a really hot sight.