What is friendship? At first blush, the answer seems obvious: Friendship is a voluntary association between people who enjoy one another’s company and care, at least to some degree, about one another’s welfare. But this definition, which would probably elicit few objections from most present-day Europeans and North Americans, does not address a number of contested issues in contemporary Western friendship. For example, is it possible for men and women to be friends? Must friends be peers in every respect, or is there room for age differences, or inequality of income, social status, or power? Can parents and children be friends? Might sexual relations play a role in friendship? Does friendship necessarily involve emotional intimacy? Are there contrasting male and female, gay and straight, working-class and middle-class friendship patterns? Each of these questions would very likely stimulate debate among the people I know, and the answers would probably depend on some combination of the generation, gender, sexual orientation, class, and cultural background of the respondent. Apart from agreeing that friends associate voluntarily, like one another, and take an interest in one another’s well-being, there might not be much consensus among my friends, neighbors, colleagues, students, and family members about the contested aspects of friendship that I have mentioned. Were we to go beyond speculation about the views of the people I encounter in my life, and conduct research on the beliefs about friendship held by a larger population of contemporary North Americans or other Westerners, I would expect to find even less agreement about what constitutes friendship. In short, friendship as we know it in contemporary Europe and North America is shaped by a variety of socio-cultural influences and ...