Although heteronormativity remains firmly in place in many contexts, challenges to a construction of heterosexuality as natural and superior increasingly emerge. However, despite increasing visibility of such challenges, bisexuality remains largely absent from such debates. Bisexual women occupy a potentially interesting position in discourses around heteronormativity and this paper explores how heteronormativity functions in the accounts of 13 South African bisexual women. Through a discourse analysis of interview data, a discourse of heterosexual marriage as normative and socially valued is identified as exerting a powerful influence on participants’ constructions of relationships and families. The findings further explore ways in which bisexuality is complicated by such a heteronormative marriage discourse and indicate a lack of integration of a bisexual identity in participants’ accounts. We suggest that drawing bisexuality into debates around heteronormativity can contribute to increased positions from which to challenge the coercive effects of heteronormativity.