A kiss can be the most innocent or intimate of moments, as simple as a greeting, as complex as the sealing of someone's fate. Maybe those various meanings capable of such a simply human act is what leads us to be so fascinated by images of the lip-lock: what is the motive, the context, the result? Despite the gesture's universal use, it's one not easy to capture on film. To celebrate World Kissing Day today, here are 10 of The Most Famous Kissing Photographs Of All Time—pucker up.

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