Some couples report that open marriage contributed to their divorces. Janus and Janus asked divorced people to list the one primary reason for their divorces. Approximately 1 percent of men and 2 percent of women listed open marriage as the primary reason for their divorce. This seems like a small percentage, but keep in mind that only 1 to 6 percent of the population have open marriages. Open marriage is perceived as a primary cause of divorce in a substantial minority of the 1 to 6 percent of people who have open marriages.