Teenage Caveman

My DEEP THOUGHTS are kind of on the same brainwavelength as an irritating 2nd grader, so a game I like to play a lot is called "who thought of that first?" Usually this goes back far enough to caveman times; things that are deeply ingrained in human culture, but are clearly culture, not nature. Like cooking an egg or eating the heart of an artichoke. Why would anyone look at an artichoke and think "maybe even though the leaves taste like poison and have sharp thorns, there might be something deep down there that's delicious if boiled and dipped in butter!"

I understand the biological impetus for genital copulation, but who was that first caveman who french kissed? Who looked over at Oog and thought, "golly, her gaping maw looks inviting - I'd like to put my mouth right on top of it and mush it around!" Or maybe there IS an biological imperative for mouth kissing - like the way birds instinctively know mating calls, maybe humans have a evolutionary instinct that says "I want to suck on the hole in your face where you stick your food in." I understand evolutionary biological reasons for why men are into big boobs and women are into guys that treat them like shit, but the kissing thing is still a mystery.

I mean.... would you want to stick your mouth on this?