For teaching these, it is useful to use sections from videos which show people from many cultures greeting, eating, starting conversations etc.. Students watch with the task of observing and recording how Italian, Saudi Arabian and Thai males and females interact with each other.
Place the students in two different rooms, so the groups cannot look at or overhear each other. In each room, they create their body language and other rules of social interaction. Then students within each group practice with each other, following their rules.
In the next stage, explorers from each culture travel to the other culture with instructions to interact and observe the foreign group's body language, conversation rules, sex roles, etc.. During this stage each group has foreign guests. Give them three to five minutes to interact. Then the foreigners return to their home cultures and report their observations to their partners. After this, a new group of explorers leaves for the foreign culture and the process is repeated until all students have spent time exploring and observing the foreign culture. Each group discusses how the two cultures differ and what they share in common.
In the last step, all members of the two cultures come together in one class. Representatives from each culture express their assumptions about the other culture. Each group tells the other group if the assumptions are correct. If the assumptions are incorrect, the groups teach their rules of social interaction.