" Only snobs kiss once, I was told, or those unfortunates who suffer from congenital froideur. I then saw what I assumed to be the correct procedure - the triple kiss, left-right-left, so I tried it on a Parisian friend. Wrong again. She told me that triple-kissing was a low Provençal habit, and that two kisses were enough among civilized people. The next time I saw my neighbor’s wife, I kissed her twice. “Non,” she said, “trois fois.”

I now pay close attention to the movement of the female head. If it stops swiveling after two kisses, I am almost sure I've filled my quota, but I stay poised for a third lunge just in case the head should keep moving. "

― Peter Mayle , A Year in Provence