Throughout western history, the act of kissing--of touching the lips either to another person’s lips or to another part of their anatomy--has had a wide variety of meanings and messages, as well as being a physical experience on its own. The essential ambiguity of what a kiss means in any particular context has been a part of its powerful symbolism and its use as a social tool, for good or ill. The physical act of kissing is an inherently intimate gesture (not necessarily in the sexual sense of “intimate”) in a way that actions like a handshake are not.