Derived from the Greek word meaning to rest upon or lean on, it is used in psychoanalysis to designate the relationship between the sexual instincts and the self-preservation instincts (or life-drive). Freud, Sigmund uses anaclisis in two main ways: first, to explain the genesis of sexuality; and, second, to explain object choice. According to Freud, sexual instincts lean on the life instincts because the body provides the erotic zones and specific pleasures or affects that it detaches and develops into sexual pleasures. For example, the breast-feeding baby obtains pleasure from suckling that is over and above---âbonus pleasureâ Freud calls it---the simple satisfaction of hunger. This affect and its object, the breast, become in turn the foundations of sexual pleasure. Similarly, the choice moves beyond auto-eroticism by attaching itself to an object initially favoured by the ego.