Why do you kiss? Because it makes you feel good down there? Because it'll hopefully lead to something that'll make you feel great down there? Probably. But what about the science behind why we kiss? Vsauce, our favorite scientific talking mouth who needs no water during his soliloquies, explains that it's something to do with being babies.

The scientific effect of kissing has been revealed to burn 2-3 calories per minute and reduce bad cholesterol and stress. But it's not like we knew that when we first swapped saliva! What we did know was that to feed babies more than just breast milk, mothers had to chew up the food to process it for their wee ones. Mouthfeeding. Watch the entire video to explore every nook about kissing. [Vsauce]