Since the American Psychological Association (APA) took homosexuality off the books as a psychological disorder in 1973, the debate over reparative therapy—an attempt to change someone's sexual orientation to heterosexuality—has continued with little rigorous research. In 2009, the APA adopted a resolution stating that mental health professionals should avoid telling clients that they can change their sexual orientation. Many question the ethics of treating someone for a condition which is not considered a disorder and posit that reparative therapy risks traumatizing the patient. Therapists also disagree about what constitutes a return to heterosexuality—whether it is celibacy, an absence of homosexual attraction, or something beyond that. Amid these concerns, organizations such as Exodus International have run reparative therapy programs with mixed success.