My appologies. These figures were reported as interviews with married people, not necessarily couples, and they reported events taking place during the marriage. The figures are similar in several studies. When the population is altered the results can be vastly different. In some cases the percentages of women engaging in extra-marital affairs exceed those for men. These biases by their nature predicte the results. For example, in cases of divorce, the woman is much more likely have to participated in an affair. Although the number is only around 50-60%. Perhaps I should gather this information and present it in a hub.