My very married, very Christian grandma used to say, “When you stop looking, you’re dead.” (She stopped looking in 2000.)
One’s eye is going to be caught by an attractive sight – there’s really no stopping it, so there should not be guilt. Guilt follows as a result from making poor choices instead of good ones. If I had an affair, that’s worth guilt (and so much more). But even though others are often attractive, I am true to my guy, so no, I don’t feel guilt. (And I don’t mean any of that “true on a technicality” crap either.)
Now, if I pursued my attractions to the point where my relationship with my guy suffers, that would be guilt-inducing. We made that promise to be First and Only for each other, ya know? But in the real world, you deal with other people, whether at work, at the grocery, or as friends. It’s what you choose to pursue beyond the innocent that matters.