The psychoanalyst Sigmund Freud (1856-1939) if famous for his theory on personality development, in which he states how a child passes 5 different psychosexual stages that lead to the development of the adult personality. He specifically describes the role of pleasure, conflict, and libido on each of those stages.
This person is already embodied in the genital stage of development (the last) that is related to adults who seek their pleasure through complete interpersonal sexual relationships and abandon previous stages of self-pleasure and the fulfilment of individuals needs.
Zach is already a 20-year old who exercises, for example, sublimation which is a mature type of defense mechanism, which transforms socially unacceptable behaviours into acceptable actions. In the long run it would permanently transform the initial impulse.
Phallic stage of the Freudian theory of psychosexual stages of personality development, which explains that expression of instinctive drives may conflict with society's expectations. So the energy that would have been used in these drives is channeled towards other forms of release, like poetry, theatre, etc., in other words, through sublimation.
Plasticity is an organisms ability to change physiologically depending on the environmental circumstances, it is the ability of an organism to change in response to an external stimuli by applying an appropriate physiological adaptive response.
