Humans do it, monkeys do it, even polar bears do it.
And now researchers have reconstructed the evolutionary origins of kissing.
Their study suggests that the mouth-on-mouth kiss evolved more than 21 million years ago, and was something that the common ancestor of humans and other great apes probably did.
Subscribe here: http://bit.ly/1rbfUog
For more news, analysis and features visit: www.bbc.com/news
#BBCNews
