"Beyond the Valley of the Dolls" is rated NC-17 primarily due to its explicit sexual content, including graphic depictions of sexual situations and strong language. The film, a satirical rock musical and a sequel to the original "Valley of the Dolls," pushes boundaries with its portrayal of sexuality, drug use, and themes of hedonism. The rating reflects the film's adult themes and its willingness to explore provocative subject matter, making it unsuitable for viewers under 17 without parental guidance.

"Beyond the Valley of the Dolls" is not a direct sequel to "Valley of the Dolls." Instead, it is a satirical, loose follow-up that was produced by 20th Century Fox and released in 1970. While it shares the title and some thematic elements related to the entertainment industry and the struggles of women, it features a different storyline, characters, and a campy tone. The film was written by Roger Ebert and is known for its outlandish style and cult status, distinct from the more serious tone of the original film.

"Beyond the Valley of the Dolls" is a cult classic directed by Russ Meyer, known for its campy style, over-the-top performances, and satirical take on the music industry and counterculture of the late 1960s. While it may not resonate with everyone due to its outlandish plot and explicit content, fans of unconventional cinema and cult films often find it entertaining. Its bold visuals and unique storytelling make it a notable entry in the genre. If you appreciate camp and satire, it might be worth a watch!

As of my last update, "Beyond the Valley of the Dolls" is available for streaming on platforms like Amazon Prime Video and Hulu. However, streaming availability can change frequently, so it's best to check directly on these platforms or use a streaming aggregator service to see if it's currently available. Always verify on the respective platform for the most accurate and up-to-date information.