Pro-feminist men are considered by some to be a stream of the modern men's movement sympathetic towards feminism. Pro-feminist men seek to add male voices to feminism and advocate change by both women as well as men in their gender relations and social, political, and institutional structures. Some feminists argue that male inclusion in the feminist movement is necessary for the universalization of the movement, and for the movement to remain relevant in the future. Since the latter half of the 20th century, more pro-feminists around the world have become involved in advocating for various causes typically associated with feminism, including but not limited to anti-rape and anti-violence activism, as well as challenging the sexualization of women in the media. Many of these activities have been chronicled in a variety of publications and books, including, since 1983, Voice Male magazine, edited by Rob Okun, himself a long-time pro-feminist.