Final answer:
Kissing on both cheeks is a cultural gesture of respect, and the scenario with Rodney experiencing culture shock illustrates the concept of folkways which dictate appropriate social behavior and vary between cultures.
Step-by-step explanation:
The gesture of kissing someone on both cheeks as a form of greeting is a cultural gesture of respect and is common in various parts of the world including Italy, France, and parts of Latin America. In the context provided, when Rodney and Elise are kissed on both cheeks by their host families in Italy, Rodney experiences culture shock because this behavior is not common in the cultural context where he is from, unless there is a romantic involvement. This example illustrates how folkways—the day-to-day practices and expressions of a culture—differ from place to place. These unwritten rules govern social behavior and can vary widely, from greeting customs to appropriate dress codes for events.