Majority of us enjoy good kiss, but did you know that locking lips with someone gives you a long life, it helps prevent tooth decay and also burns calories! Apart from bacteria swapping and reducing stress levels, it turns out there is plenty more to know about a good kiss with your partner, or whoever you happen to be swapping saliva with.

Author David Wolfe reveal few things you never knew about kissing in his video, and these are the surprising facts.

*. It increases life expectancy: Men who kiss their wives in the morning live five years longer than men who don’t.

*. It prevents tooth decay: Kissing increases the mouth’s production of saliva, which helps to clean the mouth and prevent tooth decay.

*. We swap more than just germs: We swap an average of 9ml of water, 0.7mg of protein, 0.18mg of organic compounds, 0.71mg of different fats and 0.45mg of sodium chloride when we lock lips.

*. But there are still A LOT of germs involved: One millilitre of saliva contains about 100,000,000 bacteria.

*. It actually burns calories – get kissing, ladies: Couples can burn anywhere between 2 and 26 calories per minute while kissing and can use up to 30 muscles.

*. We do a lot of it: The average person will spend an estimated 20,160 minutes of their lifetime kissing. That’s 336 hours, or 14 whole days.

*. Some more than others, it seems: The longest kiss ever recorded was 58 hours, 35 minutes and 58 seconds – nearly two and a half days.

*. Our brains know how to find our lovers lips: Sixty-six per cent of people close their eyes during a kiss. Our brains have special neurons that help us to locate each other’s lips in the dark.

*. It can stop us falling ill: There is some evidence, from past studies, to suggest that kissing provides us a means of protecting ourselves from certain viruses.

*. It’s more than just fun – it’s stress relieving: Holding hands and kissing reduces levels of the stress hormone cortisol, thereby lowering blood pressure and optimising immune response

*. There’s a scientific reason for why we want more: When you kiss someone for the first time you get a spike in dopamine, which makes you crave more.