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I also thought the aspect of sex in the movie was very interesting. The SRAs were created through cloning, and therefore without sex. The fact that they now need sex to survive is ironic, because they were created without it, but cannot continue to exist without the sperm that Ruby collects from her outings. Sex is a very complex concept, which involves biological processes, physical actions, and emotion. This movie reduces the concept of sex down to the simple fact that it is needed for the survival of the SRAs.