Hi marciobarbalho,
The life instinct or Eros was one of the two basic instincts described by Freud in Beyond the Pleasure Principle (1920g), when he began to construct his structural theory, in which the life instinct stands opposed to the death instinct. The life instinct subsumed uninhibited sexual instincts, instinctual impulses inhibited in respect of their aim and sublimated, and the instincts of self-preservation.
Life instinct = in psychoanalytic theory, the instinct of self-preservation and sexual procreation.
Regards.
V.