Yes, in "The Blue Lagoon," the character Emmeline, played by Brooke Shields, does experience her first menstrual period. This moment signifies her transition into womanhood and adds to the themes of adolescence and sexual awakening in the film. The scene is handled in a way that emphasizes the innocence and naturalness of growing up, reflecting the challenges and changes that come with maturity.

At the end of "The Blue Lagoon," Richard and Emmeline are not depicted as dead. Instead, they are shown drifting on a raft after their boat capsizes. As they are rescued, it is implied that they have survived the ordeal. The film concludes with the couple embracing the possibility of a new life together, suggesting hope rather than death. The ambiguity of their situation leaves room for interpretation, but the overall tone indicates they have not perished.

"The Blue Lagoon" is a romantic drama film released in 1980, directed by Randal Kleiser. It tells the story of two young cousins, Richard and Emmeline, who are shipwrecked on a deserted tropical island in the South Pacific. As they grow up in isolation, they develop a deep bond and explore their budding sexuality amidst the beauty of nature. The film explores themes of innocence, love, and survival, contrasting the simplicity of their life on the island with the complexities of civilization.

In the movie "The Blue Lagoon," the characters Richard and Emmeline are stranded on a deserted island for about five years. They are shipwrecked as children and grow up together in isolation, experiencing the challenges and joys of life in the wild. The film explores their coming-of-age journey and the development of their relationship during this extended period of solitude.