changes. Freud hypothesized that human mental life is governed by libido, a mental energy which is determined by nature. Libido moves throughout the body during the course of development, determining what type of stimulation is gratifying. Freud proposed five stages: oral, anal, phallic, latency, and genital. These stages correspond to localization in the body of the libido.
             One problem with Freud's theory is that he attempted to cons
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