In the
second edition of his book Practical
Ethics, Peter Singer writes:
[T]he first thing to say about ethics
is that it is not a set of prohibitions particularly concerned with sex. Even in the era of AIDS, sex raises no unique moral issues at
all.
Decisions about sex may involve considerations of honesty, concern for
others, prudence, and so on, but there is nothing special about sex in this
respect, for the same could be said of
decisions about driving a car. (p. 2, emphasis added)