Answer:
According to Sigmund Freud's psychoanalytic theory, sex difference awareness and gender identity development occur during the psychosexual stages of development. Freud proposed that children go through a series of stages in which they develop their understanding of their own bodies, their gender identity, and their attitudes towards the opposite sex. One of the key stages in this process is the phallic stage, during which children become aware of their own genitals and develop a sense of gender identity. Freud's ideas on gender development have been influential but have also been critiqued and revised by subsequent psychological theories.
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