Should same-sex couples be permitted to marry? Are civil unions or domestic partnerships sufficient? What kind of effect does same-sex marriage have on heterosexual marriage? Do the children of same-sex couples face undue challenges because of their parents? These questions have all been raised in the ongoing debate about gay marriage. Prof. Dale Carpenter makes a compelling argument in favor of same-sex marriage from a philosophical, rights-based perspective while presenting data to answer these questions and others.