taste governs every free - as opposed to rote - human response. Nothing is more decisive. There is taste in people, visual taste, taste in emotion - and there is taste in acts, taste in morality. Intelligence, as well, is really a kind of taste: taste in ideas.
Humans are the only animal that blushes, laughs, has religion, wages war, and kisses with lips. So in a way, the more you kiss with lips, the more human you are. And the more you wage war.