Zhang Ziyi and her boyfriend show affection on the beach, their actions rivaling a "third-level" film. (Note: The term "third-level" is often used as a euphemism for adult or risqué content in some contexts, but it's important to use appropriate language. If this is for a formal or public setting, we might adjust the wording to be more suitable.) A more appropriate translation could be: Zhang Ziyi and her boyfriend display affection on the beach, with actions that are quite intimate.