But wait, the term "sex" is pretty explicit. I need to check if that's what they really meant. Maybe "sek" is a local slang or a different term altogether. However, considering the context and the possible intent, it's likely about adult content.
Perhaps there's a misunderstanding in their query. Maybe "sek" is part of a different context. But given the combination with "Viet Nam 2021", it's safer to assume they're referring to adult content.
The user might be looking for a specific movie that's not well-known. Since I don't have up-to-date data on all films from 2021, especially in Vietnam, I should avoid making assumptions.