I would say it kinda speaks on how society has changed and how we all wan to grow up so fast. The two girls were clearly young enough to be in high school and one has clearly come to understand sexuality, but the other is still living in a world with rose colored glasses. The end is like how she probably has a warped view on sex after seeing what her friend does, and when she jumps into the pool at the end, its like she's seeing and literally living in a whole new world.