Eros, Thanatos, Species

According to both Freud and Marcuse, Eros, the Life-principle, seeks gratification, gratification is a state of rest, the seeking of a state of rest is the Nirvana principle, and the Nirvana principle is grounded in Thanatos, the Death-drive.  So, according to both, the unprecedent introduction of Thanatos into the concept of the Psyche is entailed in the implication in it of Eros.  However, the premise that Eros seeks gratification presupposes that it is an attribute of an Individual whose participation in the process ends in gratification, e. g. an orgasm.  In contrast, if Eros is attributed to the Species, there is no such moment of cessation; rather, it seeks continuation, e. g. fertilization, etc.  On that basis, Thanatos is not entailed in Eros; rather, it is exposed as an expression of the finitude of the Individual.  So, the diagnoses of both Civilization and its Discontents and Eros and Civilization, insofar as they assume that entailment, are inadequate.