Many questions women ask ourselves about how to achieve equality can only be answered if we understand men and masculinity. The Women’s Liberation Movement triggered a worldwide debate about men, and a generation of research about what proved to be masculinities - in the plural. Over the last thirty years, knowledge has accumulated about men’s diversity and collective power, and the making and re-making of masculinities. This helps us understand men’s predominance in the corporate and political world, and problems of private life from how to share housework to how to stop domestic violence. How can we understand the dilemmas of men and boys today - and their potential for a more peaceful and gender-equal world?