During the APA's heated debate in the early 1970s about the declassification of homosexuality as a mental illness, Green argued forcefully in favor of declassification. He argued that the grounds for deciding the issue should be the "historical and cross-cultural groundings in homosexual expression, associated psychiatric features accompanying a homosexual orientation, the emotional consequences to the homosexual of societal condemnation, and behaviors of other species". Green applauded the eventual APA decision while strongly criticizing the fact that the administration put it to a vote, saying that such "a shotgun marriage between science and democracy" was "ludicrous".