Synesthesia

Synesthesia: Synesthesia is a recent word composed of Greek roots: syn (as in synonym) meaning same, and esthesia (as in anesthesia) meaning senses. In synesthesia the senses are combined together. People with synesthesia might see letters or numbers as colored or see sounds as colors. This is not metaphorical, but an involuntary sensory phenomenon.

The taste of food, the smell, was as erotic as sex, synesthesia.