You have to see:

Her eyes are wide as they stare into yours. You wrap your arm around her waist and pull her in close. She touches your face and you lean in, tilt your head – to the right, of course – and your lips connect. The rushing sensation leaves you little room to wonder, “Why the hell am I doing this anyway?”

Of course, the simplest answer is that humans kiss because it just feels good. But there are people for whom this explanation isn’t quite sufficient. They formally study the anatomy and evolutionary history of kissing and call themselves philematologists.

Of course, we can think of a kiss as somethin careless and just fun. Decide for yourself: