I always though sharing food was stupid, eat your own food, it's the same thing on my plate. Same with the wedding cake ritual, wtf?
"According to researcher Paul Rozin and colleagues from Columbia University, there are four different levels of food sharing that express to observers how romantic you are with your significant other: no sharing, sharing voluntarily, sharing with consubstantiation (situations in which your partner eats food that you have already touched) and feeding."