In the mid-twentieth century, Colombian neo-Gnostic guru Samael Aun Weor (1917-1977) spread the teachings and practices of ARCANUM A.Z.F. – his system of sexual magic. Aiming to use sex-power to create an astral body that lives on after death, Weor’s system of sexual magic has two main pillars – a mandate that sex magic must only be practiced within the context of a heterosexual marriage, and a forbiddance on ejaculation/orgasm. Additionally, Weor’s system identifies two main adversaries: the demoness Lilith and her “henchmen” – homosexuals. Weor’s association of Lilith and homosexuality within his system expands upon Lilith’s discursive history as a monstress, and deploys Lilith as a demonic disciplinarian, policing the boundaries of acceptable sexuality laid out within Weor’s teachings. Moreover, this association represents an esoteric example of a much broader historical trend linking queerness with monstrosity. To further dissect this enduring entanglement using ARCANUM A.Z.F. as a case study, this paper applies monster theory to a textual analysis of Weor’s seminal work The Perfect Matrimony (1950). I suggest that Weor’s association between Lilith and homosexuality functions to create a demonic threat that serves to implement a fear-based enforcement of semen retention and spiritually-mandatory heterosexuality amongst his followers. By positioning Lilith as the ultimate embodiment of evil, in tandem with presenting homosexuality as the gravest psycho-sexual perversion, and associating the two in collusion, Weor’s teachings ultimately perpetuate the portrayal of the Queer as Monster, within an esoteric context.