Why do we kiss?

This question will replace the tongue one as its not strong enough. We only did one shoot with the kisses and immediately got a  playful and funny image. With a bit of colour adjusting and saturation, this could look bright. 
I love the end image, Dylan looks drunk on kisses. I like the question too, as its something we all practically do each day and will make you wonder why and where we exactly get this idea from.