Yes, you should watch "Before Sunrise" before "Before Sunset." "Before Sunrise" introduces the main characters, Jesse and Céline, and their initial romantic connection in Vienna. Understanding their backstory and the development of their relationship is crucial for fully appreciating the themes and emotional depth in "Before Sunset," which takes place nine years later as they reunite in Paris. Watching them in order enhances the experience and provides context to their conversations and the evolution of their relationship.

As of my last update, "Before Sunset" may not be available on Netflix, as streaming availability frequently changes. To confirm its current status, it's best to check Netflix directly or use a streaming guide to see if it is offered. Additionally, "Before Sunset" can often be found on other platforms like Amazon Prime Video, Hulu, or rental services.

Yes, "Before Sunset" is a sequel to "Before Sunrise." Released in 2004, it continues the story of Jesse and Céline, who first met in Vienna in 1995's "Before Sunrise." In "Before Sunset," they reunite in Paris nine years later, exploring their feelings and the choices they've made since their initial encounter. The film, directed by Richard Linklater, is part of a trilogy, with "Before Midnight" following in 2013, further developing their relationship.

"Before Sunset" is rated R primarily for its language and mature themes. The film features adult conversations about love, relationships, and life's complexities, including discussions of infidelity and emotional intimacy. The characters engage in candid dialogue that includes strong language and mature subject matter, which contribute to its R rating. The film's focus on the nuanced dynamics between the characters also reflects a level of emotional depth that is suited for an adult audience.