In keeping with Jacques Lacan' s emphasis on the implications of the sexual drive for the Freudian subject, this essay attempts to delineate the complicated contour of Freud's theory of sexuality, the drive, and the three agencies of psychic apparatus. In the first subsection, I argue that Freud's configuration of sexuality, in particular the concept of partial drives, devolves on metonymic dispersion. This movement culminates in the notion of Eros as a primal drive that merge the self-preservatory drive and the sexual drive. The following subsection delves into Freud's conceptualization of the drive, highlighting that it is underpinned by the primary polarity of the subject and the object, yet, at the same time, tends to radically disrupts the conceptual framework. In exemplifying this, I draw on the mechanism of sado-masochism and the primary narcissism. In the last subsection, my discussion is centered on The Ego and the ld, examining the intriguing convergence of the new structure of the mind and Freud's final conceptualization of two primal drives as Eros and the death drive. I seek to inquire into what important bearings Freud's notions of Eros and Thanatos have on the three agencies of psychic apparatus, ending this essay not so much with a definitive answer as with a suggestion for further studies, The theoretical potential of Freud's notion of sexuality to move beyond the simplifying binary of essentialist and constructionist views on sexuality may be embedded in what Freud himself calls the interminable process of analysis.