Everyone is doing a code of ethics. But when can codes do good? To find out we interviewed New South Wales parliamentarians about their perceptions of corruption in 10 scenarios weighted from least to most corrupt. The cases were drawn from John Peters and Susan Welch's theory of corruption. We note similar studies in the United States and Canada. There is confusion about ethics, and we note that the episodes of corruption in the 1980s suggest ethical standards could be elevated. Perhaps the most significant conclusion is that parliamentarians come to think alike about corruption in the middle of their careers. Those who want to see ethics enhanced should aim at induction, education, and counselling within parliament. Here codes, if supported, have a role to play. Improvement will not be achieved by searching for a saintly parliamentarian. We found those most sensitive to corruption to be the least and most senior members.