Ethics signifies an aspect of human life that can also be called morality. There seem only minor differences in usage between the two terms. We speak more naturally of professional ethics than of professional morals to refer to virtues and codes of behavior of specific professions. This is not, however, because the word moral is restricted to human beings, or rational persons, as such, because we also speak naturally of role morality. A somewhat more substantial difference is that some forms of behavior especially related to sexuality, such as homosexuality, abortion, and premarital intercourse, are condemned (by some) as immoral where unethical would not be used. This usage may require a notion of a natural order (possibly of a religious character) that certain actions violate, even if they do not cause harm in some other way. At the same time, immoral and unethical are...