Not surprisingly, swingers develop more STDS than non-swingers, especially if they’re older women, according to a 2010 study of visitors to a Dutch clinic that provides free screening and treatment. Among straight women over the age of 45, 17.9 percent of the swingers tested positively for chlamydia, gonorrhea, or both, (compared to only 4 percent of women who didn’t swing). Of the straight male swingers in that age group, 10.4 percent tested positively for those diseases (compared to 2.4 percent of non-swingers).