According to Freud, sexual impulses are a central factor in personality development, he believed that sexual feelings are closely linked to children’s basic way of relating to the world such as nursing and moving their bowels. Freud’s theory also believes that instincts or unlearned psychological drives that provide the energy for the developmental process have their energy in the biological needs of the organism.
Freud also believed that problems and conflicts encountered at any stage influences personality in adulthood. Conflict resulting from someone being deprived at any stage results in one’s pleasure drives being stuck or arrested at that stage, this is defined as fixation.
According to Freud, the mental life of an individual is divided into three stages, it is believed that the Psycho-Sexual stages originated from the sexual instinct which he called the Id, in addition to the Id, Freud postulated the Ego and the Super-ego. These unconscious processes make up personality structure and also influence the developmental stages in the human organism.
The Id is the part of the personality that is present at birth, it comprises a person’s basic and sexual impulses that demands satisfaction, it is said that the Id is the Mr. Hyde emerging from the restrained Dr.Jekyll, the Id is selfish and pleasure oriented it operated on the pleasureprinciple.