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.
One of the peculiar sins of the twentieth century which we've developed to a very high level is the sin of credulity. It has been said that when human beings stop believing in God they believe in nothing. The truth is much worse: they believe in anything.
