I'm a 26 year old dude from Norway. I'm 183 cm and 110 kg. Meaning I'm heavy build guy but with a somewhat fair amount of muscles. Not ugly nor good looking.
My job is irrelevant and so is my education for this question. I'm comfortable in my own skin. Heterosexual. Known to be cocky-funny, laid-back, kind hearted and a trusted friend.
When I'm at at a social gathering like a party. I often sit on a chair and talk random and casualy to the people present. We joke, laugh and have fun. And always 10-20 times during the party people who walk by me pat my back, lay a hand or two on my shoulders, puts a hand on my head for a short time etc. Both guys and girls do this. Both loudspeaking and silent people.
The touch is always soft and done in a way that feel friendly. The touch is almost casual and lasts only for a couple of seconds but it is almost always done only to me. Almost never have I seen people do this to the other people present in the room.
I have been kissed on almost every inch of my head by both boys and girls who walk by me and I always return the gesture with a smile or a small laugher depending on wheter it is a male or a female kissing ;-)
I never feel intimidated by this nor the people doing it and they do it regardless of anyone looking at me/them.
Why do they do this? Is it some sort of approval? Is it some sort of trying to alpha-male me? Intimidate me? Do they want to show that they like me being there?
I ask because people have been like this to me atleast the last 10 years of my life. An I'm interested in the social mechanics behind it.