I can imagine sensation if I want, but as a 'for instance,' I know I don't like some foods because of certain sensations, but don't have to perceive them when I remember why. I can't imagine that most people aren't the same, or we'd have a lot more people gagging randomly as they walk around. Sure, some people will be slightly perturbed if you mention certain things, like fecal matter, horrible farts, the feeling of biting down on aluminum.... but those perturbations pass in moments.