The Blue Lagoon is often ridculed as a fluff piece of adolescent nudity. However I believe The Blue Lagoon raises interesting questions about human sexuality. How did we discover sex, and what about our sexuality is innate?
The movie presents the case of an innocent boy and girl from the Victorian Age, shipwrecked on a beautiful tropical island. They are soon without any adult guidance whatsover. As children, the two are inseparable, but the movie presents a plausible change in their relationship as they start to go through the changes of puberty. They don't understand the physical changes that are happening to their bodies. And they start to become distant and secretive and angry with each other and they don't quite understand why.
What they don't realize is that these changes are part of the process of moving apart and developing a separate sexual indentity from each other. Only after we see the steps of this transformation to sexual maturity completed do we see they are ready to discover human's oldest instinct in each other, which comes naturally to them in time. They then go on to discover the mysteries of parenthood and the psychological changes that come with that. Other themes such as religion and law are explored as well.
What keeps this movie watchable is the beauty of the actors and the beauty of the island. The scenes on the lush tropical island and the bright blue ocean are beautifully shot and dreamlike. The natural beauty evokes a Garden of Eden. And this movie seems to try and explore the relationship that might have existed between Adam and Eve in the Garden of Eden, learning about love, sex, and children all on their own. And I think the movie gives it a pretty good shot. The Blue Lagoon is much deeper than people give it credit for.