Smell. I love the taste of food too much to lose taste, and the other's aside from smell are all important. Especially touch, both for the fact that pain is a necessary evil to stay healthy and injury-free, and the whole 'pleasure' thing (what point is there in sex and masturbation without a sense of touch, and thus no feeling?).
So yeah, smell. At least then I wouldn't have to worry when it comes to cleaning up my dog's mess, or when he or my dad fart (or after my dad's been to the toilet...)...