I like hairy guys--hairy chest, arms, legs, all a turn on, and a hairy back is great too. But I wouldn't turn a guy down just because he is or isn't hairy, it's also about personality.
And red pubes are fine. I like natural pubes, and I really like the contrast of different colors. Mine are brown (geez, now with a few WHITE ones ARGGHH!) and I like seeing them next to a blond bush, or a dark black one, or red. . .I am actually attracted to the different colors, and I like it best if it's bushy.