would get them to change." Although a majority of swingers reported changing their behaviors in response to HIV/AIDS, some chose to become more selective in choosing partners rather than adopting safer sex practices. Greater selectivity in choosing partners is not a reliable means of reducing the spread of HIV/AIDS. Many people are not aware they are infected, and no outwards signs of infection may be visible. One psychological study suggests people may not be particularly good at detecting lies about HIV status. Remarkably, one-third of swingers flatly rejected the idea of changing their behaviors in response to HIV/AIDS. These finding suggest people involved in open marriages may indeed be at somewhat greater risk of sexually transmitted diseases, including HIV/AIDS. Psychological factors Several authors consider open marriages to be psychologically damaging. They claim sexual non-monogamy proves too difficult for most couples to manage, and their relationships suffer as a consequence. These authors contend that sexual non-monogamy provokes jealousy in couples. This disrupts couples' sense of security in their relationships and interferes with their sense of intimacy. Consequently, these authors view open marriage as a "failed" lifestyle. Other studies have found that couples report high levels of satisfaction and enjoy long-lasting open marriages. Other couples drop out of the open marriage lifestyle and return to sexual monogamy. These couples may continue to view open marriage as a valid lifestyle for others, but not for themselves. Still other couples experience problems and report that open marriage contributed to their divorces. Loss of social support Strong social disapproval of open marriage may lead to a loss of psychological and health benefits. People in open marriages may hide their lifestyle from family, friends, and colleagues. Blumstein and Schwartz note: Keeping their lifestyles secret reduces the amount of social support available to people in open marriages. Incidence In 1983, Blumstein and Schwartz determined that out of 3,498 married men, 903 had an agreement with their spouses allowing extramarital sex; of these, 24 percent (217 men) actually engaged in extramarital sex during the previous year, and overall 6 percent had been actively involved in open marriages during the previous year. The number is only slightly less for women, where of 3,520 married women, 801 had an agreement with their spouses allowing extramarital sex, and 22 percent (or 176 women) actually engaged in extramarital sex during the previous year. This means about 5 percent of married women were