Relationship standards are beliefs about what makes a good romantic relationship. To date, no research on relationship standards in same-sex relationships has been conducted. This paper describes development of the Rainbow Couples Relationship Standards Scale (Rainbow CRSS). In common with measures of relationship standards developed with heterosexuals, the Rainbow CRSS assesses the importance people attach to Couple Bond standards (expression of love, caring, intimacy), Family Responsibility standards (extended family relations, maintenance of face and harmony), Religion, and Relationship Effort standards. The Rainbow CRSS also assesses three standards hypothesized to be of particular importance to same-sex couples: Relationship Outness (public disclosure of the relationship), Sexual Openness (acceptance of open sexual relationship), and Dyadic Coping with Homophobic discrimination. Participants were 414 same-sex attracted men and women who completed the Rainbow CRSS online, plus some validation scales. The Rainbow CRSS showed a coherent two-level factor structure that was similar to that in heterosexual couples for the Couple Bond and Family Responsibility Scales. Same-sex attracted people's standards were similar for men and women, and for singles versus those in a relationship. Same-sex attracted people's standards were very similar in endorsement of Couple Bond, Family Responsibility, Religion, and Relationship Effort standards to those of heterosexuals. The Relationship Outness and Dyadic Coping with Homophobia scales assessed potentially important standards that reflect some distinctive challenges for same-sex couple relationships.