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Any part of the [[body ]] susceptible of becoming excited, of [[being ]] a seat of [[pleasure]], is an [[erotogenic ]] zone. [[Freud ]] nevertheless used the term to refer primarily to a [[number ]] of specific areas, notably, the genitals, mouth, and anus. These zones he saw as locations of [[particular ]] [[instincts ]] known as "component instincts." In [[neurosis]], on his account, nongenital [[erotogenic zones ]] come to function as substitutes for the genitals. The [[idea ]] of erotogenic zones was inseparable from the [[theory ]] of [[libidinal ]] [[stages]], each of which, at a certain age, is fixed...