Aphanisis is derived from Greek and means "disappearance." Originally meaning the loss of brilliance in astronomy (such as a fading star), this term is commonly used in psychotherapy and psychoanalysis to refer to a loss of sexual desire. By extrapolation this is related to Freud's concept of castration anxiety and was proposed to encapsulate a broader spectrum of sexual fears. This term was used in psychoanalysis in regards to both males and females.

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