A good old smooch. It’s something that we do on a daily basis in one form or another (if we’re lucky), and yet have you ever stopped and wondered why we do it?

Wonder no more.

On today’s Betwixt the Sheets we’re joined by Emmy award-winning scientist and author of The Science of Kissing, Sheril Kirshenbaum, to find out answers to questions such as, why has the letter X has come to mean a kiss? What role has the colour of our lips played in our evolution? And why do men prefer kissing with more saliva?

This episode was edited and produced by Stuart Beckwith. The senior producer was Charlotte Long.

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