We kiss, and we kiss a lot. From cheek to cheek, lips to lips, tongue to tongue, kissing happens anywhere and everywhere, and it feels great. But why do we do it?

In this video by PBS Digital Studios, Joe Hanson explores the science of kissing and why it feels good in general.

When you really think about it, kissing is an odd human behavior. You know, all the rubbing of our faces all over each other. So there must be a good reason why we do it, right? From motherly comforts to testing the genetic compatibility of your "mate" . . . the science of kissing is pretty awesome.

Find out why we kiss in the video below: