In this paper I attempt to clarify from a Buddhist perspective a key ethical principle relating to a diversified family structure and same-sex marriage. The movement calling for the legal recognition of same-sex marriage is primarily motivated by a desire to solve the difficulties faced by same-sex couples relating to their inability to legally marry, and this motivation is in consonance with the Buddhist emphasis on compassion and the removal of suffering. Taking the Buddhist teaching on refraining from sexual misconduct as defined in the ten courses of wholesome action" as an ethical principle supporting the legalization of same-sex marriage, I highlight a number of relevant points supporting same-sex marriage which have not been previously discussed. I demonstrate that same-sex marriage should not be seen as a form of sexual misconduct and that the principles of fidelity and mutual respect apply equally well to opposite- and same-sex marriage, despite the differences between the two. Thus can be seen that there is substantial scriptural support for same-sex marriage and that its legalization is in consonance with the Buddhist teachings on compassion and the removal of suffering, for both oneself and for others.