I can see certain curvy girls as attractive but there's a line where it gets to be a little sloppy. A big part of the fat turnoff thing for me is that I used to be fat and so being with a fat person takes me back to how awful it was and how everyone judged me. I did the work to leave that life behind and I don't care to relive it in any way.
They can be. I personally focus a lot more on face than on body for the purpose of dating (the last girl I dated was obese). As far as body is concerned, I tend to like athletic girls (not skinny, athletic), but I have seen some chubby girls that were pretty attractive too.