According to what I read, casual physical contact is restricted to young children towards the parents.
After about 10 years old physical contact with family is mostly reduced to special cases.
Physical contact between peers and family is rare.
Then contact is restored with a boyfriend/girlfriend.
(except for the bleeding noses, who the hell came up with that one anyway?).
Let's see. Using logic I conclude:
amine/manga has as extra in the image:
Extra thick blood vessels, extra drop of sweat, Less colored eyes, nosebleed
Those are the ones I'm remembering anime shows.
My logic behind it:
The same way that the sweat exists, the thick head blood vessels, etc... exists. This is just one more of 'em.
Let's see... When you see something you sexually like (for most man -> naked beautiful woman) the blood pressure rises a bit and many people actually feel that throbbing in the nose. It is known that the blood vessels in the nose are quite small. So the logic seems to be: "That chick's sooo tham hot that my blood pressure is pumped so high that I get nosebleed".
Anyway, the reaction to a beautiful body is always higher if the first thing you see is already what you see is someone you consider beautiful.