About kissing in America, it varies greatly from house to groups of people.
A bunch of white girls from a Unitarian society I know are very touchy-feely with each other. In my public school, only some groups are comfortable with kissing. Doesn't matter race/ethnicity, just depends on your household really.
So the stereotype that westerners kiss each other a lot? That's mostly France and close knit girlfriend groups, from my perspective as an America