ObjectivesWe included two sacrifice constructs to reflect the awareness and (in)equity of behavioral sacrifice in same‐sex relationships: (a) the receiver's awareness (whether the receiver under‐, over‐, or unbiasedly estimated the other's frequency of sacrifice behaviors) and (b) the provider's perceived (in)equity (whether the provider perceived themselves as underbenefitted, overbenefitted, or equitably treated). We then tested how heterosexist discrimination related to same‐sex couples' relationship quality via receivers' awareness and providers' perceived (in)equity.BackgroundSacrifices are pro‐relationship efforts in which individuals forgo self‐interests for the partner or the relationship. The links from sacrifice to same‐sex couples' relationship quality are still understudied. Further, no study has examined whether sexual minority stressors relate to sacrifice in same‐sex relationships.MethodWe used dyadic, survey data from 141 same‐sex couples and conducted actor–partner interdependence models.ResultsFor receivers' awareness, unbiased estimation and overestimation were related to higher relationship quality; underestimation was related to lower relationship quality. For providers' perceived (in)equity, being underbenefitted—a situation in which individuals perceived that the other made fewer sacrifices than they did—was related to lower relationship quality. For indirect pathways, when one individual encountered heterosexist discrimination, this individual's sacrifice was likely underestimated by the receiver; in turn, this individual's partner experienced low relationship quality.ConclusionsTo better understand sacrifice and relationship quality for same‐sex couples, heterosexist discrimination should be considered.ImplicationsInterventions are needed when practitioners work with same‐sex couples who feel that their sacrifices were underestimated, and efforts are still needed to reduce heterosexist discrimination.