I don't eat near the computer. It's far too easy to get your keyboard and things dirty, then your peripherals start wearing out faster than you'd like.
Its cliche, but I eat pocky while reading/watching hentai/anime. Luckily there's a big Asian store in town. I buy them in bulk cause they're so addicting.
I don't actually think I've ever eaten whilst reading / watching hentai, might have had some snacks once or twice but it's nothing I actively try to do.