A cutting-edge study of marriage’s transformative effects on same-sex relationships.    It is no secret that marriage rates in the United States are at an all-time low. Despite this significant decline, the institution of marriage endures in our society amid historic changes to its meaning and practice. How does the continuing strength of marriage impact the relationships of same-sex couples after the legalization of same-sex marriage? Drawing on over one hundred interviews with LGBTQ+ people, Marriage Material reveals the transformative impact marriage equality has had on same-sex relationships. Sociologist Abigail Ocobock looks to same-sex couples across a wide age range to illuminate the complex ways institutional mechanisms work in tandem to govern the choices and behaviors of individuals with different marriage experiences. Ocobock examines both the influence of marriage on the dynamics of same-sex relationships and how LGBTQ+ people challenge heteronormative assumptions about marriage, highlighting the complex interplay between institutional constraint and individual agency. Marriage Material presents a bold challenge to dominant scholarly and popular ideas about the decline of marriage, making clear that gaining access to legal marriage has transformed same-sex relationships, both for better and for worse.