While it's not a replacement for exercise, kissing can burn calories. A passionate kiss can burn anywhere from 2 to 6 calories per minute.
Kissing triggers the release of endorphins, the body's natural feel-good chemicals. It can improve mood, reduce stress, and even alleviate pain.
Kissing is a common human behavior found in virtually every culture around the world, though the meaning and customs associated with it can vary widely.
Kissing engages a surprising number of facial muscles. Depending on the type of kiss, it can involve anywhere from 2 to 34 facial muscles.
Kissing can increase saliva production, which helps rinse away bacteria and strengthen tooth enamel. However, it's not a substitute for regular dental care.
Kissing dates back thousands of years. The earliest known reference to kissing comes from ancient India's Vedic scriptures, which were written around 1500 BCE.
The scientific study of kissing is called philematology. Researchers in this field examine various aspects of kissing, including its cultural significance, neurological effects, and more.