And how dare I question it or anything outside of it right? Sounds very smart and sciency,I will leave you to it then.
Oh,and I meant introspection, actually asking people, psychological examination of the subject are part of the evidence picture before you come to a conclusion. Apparently,anything short of an explanation involving an "evolutionary" need to exchange chewed food (even though many cultures don't do intimate kissing -- I suppose your claim is those humans evolved differently and have adopted it in the last century against their evolutionary need?) is offensive to your line of thinking.
Insight obtained from introspection or evolution in the 100 year scale will be mostly psychological/cultural. If you want to understand the big picture including physical justification you need to look at the large time scale perspective because it takes much longer for those changes, psychological and cultural justifications are dependant on the physical. Maybe that's too "booky or sciency" of a perspective, but I don't think so.
The evolutionary biology approach provides pretty deep insight into human behaviour. Making out is a dissociative state where each person uses their highly developed talking muscles to physically interact with each other. No other body part even makes physical sense. Your ear lobe isn't dexterous - that would be one way interaction.
>Please, take as much closer look as you want but do look at the whole picture,not just the booky part. Ask yourself why you enjoy it first,ask why others enjoy it and start there and stop when you have enough to adequately explain it.
How is your inward facing perspective as "the whole picture"? Evolutionary biology is the whole picture.