Abstract

Commonsense morality holds that monogamy is morally permissible. In this paper I will challenge this, arguing that monogamy is in fact morally impermissible. First I’ll argue that monogamy’s restriction on having additional partners seems analogous to a morally troubling restriction on having additional friends. Faced with this apparent analogy, the defender of monogamy must find a morally relevant difference between the two kinds of restriction. Yet, as I’ll argue, there seems to be no such morally relevant difference, for the standard defenses of monogamy all fail. I take this to be evidence that monogamy’s restriction on having additional partners is in fact morally analogous to a restriction on having additional friends. Just as a restriction on having additional friends is immoral, so, too, is monogamy’s restriction on having additional partners.