I'm a little turned on by it, but I have a fetish for women's mouths. I find them really sexy, so watching women eat is even a mild turn on for me. If they're not really enjoying it, or it looks fake, though, that's not gonna do it. I get turned on by her getting turned on. I think that's true for the majority of people.
I know, I'm twisted. It's the twists that make people interesting.