A normal kiss burns 6.4 calories per minute. A passionate kiss can burn up to 20 calories per minute.
Today, an average kiss lasts more than 12 seconds. In the 1980s, couples came up for air sooner than that: back then an average kiss lasted a mere 5.5 seconds.
With an average of four kisses per person and day, Germany ranks second behind Sweden on the list of countries that are stingy kissers. People in France and Italy do much better: they kiss an average of seven times per day.
Researchers study kissing in a field of science called philematology. They've discovered two out of three people tilt their heads to the right when kissing.
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