Marilyn Chambers 1972 adult film, Behind the Green Door was a game changer. No only did it introduce the X-rated film set to former Ivory Snow model Marilyn, but the film prominently included the first major sex scene between a white female and a black male.
It's been too many years since I've actually viewed the movie, but it did elevate the sordid world of porn films somewhat. After Green Door, better production values and slightly better plotting became more common in adult films. Chambers had a storied "acting" career, and she even crossed over on rare occasion to standard movies, such as the horror film, Rabid. However, when it came to XX-film work, there was literally nothing that Marilyn wouldn't do. She gets an "A" from the Catacombs for that level of commitment.
Either way, she really "earned" her fame and notoriety, and with her recent death, many condolences go out to her family, friends and fans.