Recent scholarly work has focused on the erasure and mistreatment of bisexuality in histories of sexuality. Such erasure is not only observed in academic work but also in the lived experiences of people who identify as plurisexuals. The present paper brings together studies on bisexuality, hegemony, and sexual politics to explain the discursively produced demarcation between sexualities and forms of sexual expression, and it supports a focus on monosexuality as a theoretical construct that productively addresses issues of discrimination and marginalization that people identifying as plurisexuals endure. What is put forward and challenged through this paper is the functional potential of monosexuality to maintain a sociodicy whereby the nuclear family and its contingent material implications remain not only unchallenged and normative but also inevitable.