Kiss

The first onscreen kiss was captured in 1896 by the Edison Co. in "The May Irwin -- John C. Rice Kiss," showing a couple kissing and talking. They were dressed formally, and he sported a large mustache. Audiences were scandalized."The spectacle of their prolonged pasturing on each other's lips was hard to bear," fumed publisher Herbert S. Stone in a review. "Such things call for police interference." Warhol's 1963 film Kiss is a 54 minute long view of different couples kissing.

More on kissing, from The Science of Kissing: 

• Do you tilt your head to the right when you kiss? 90% of the world does.
• 90% off the world kisses with their mouths now, though the custom has spread from European civilization as recently as the 20th c. 
• There here is a 50% chance that a first kiss with a person will be the last--people use the information gleaned from a kiss, like the genetic compatibility indicated by their smell, to take it or leave it.
• Only 13% of prostitutes' clients demonstrate an interest in French kissing, presumably because kissing involves more than physical pleasure