Psychoanalysis should attend to same-sex marriage for two reasons: (1) Exclusion from marriage harms the mental health of same-sex couples and their children and (2) psychoanalysis is the science of irrationality, and the arguments about same-sex marriage are often highly irrational. The arguments against same-sex marriage, made by senior judges in the United States, are best understood by the von Domarus principle: If homosexuals are allowed to be married, and I am married, then I may be a homosexual. And if I make it impossible for homosexuals to marry, and I am married, then I will make it impossible for me to be a homosexual.