Polyamorous Families, Same-Sex Marriage, and the Slippery Slope

Opponents of same-sex marriage identify multiple-partner families as the pivotal step that, were same-sex marriage legalized, would propel society down a “slippery slope” to relational chaos. Like the families of same-sex partners, polyamorous families—or those with adults in openly conducted multiple-partner relationships—demonstrate alternate forms of kinship not necessarily dependent on conventional biolegal kin, sexual connections, or even chosen kin ties as previously understood. This article extends sociological knowledge by detailing characteristics of relatively unknown family form; comparing original data on polyamorous families with published research on same-sex families instead of heterosexual families, a contrast that decenters heterosexual families as the sole measure of legitimacy while simultaneously expanding knowledge about same-sex families and explaining how polyamorous families’ differences have implications for the same-sex marriage debate and how these shifting social norms implicate changes for the field of family studies and larger society.