Adult Swingers according to 2005 estimates by the Kinsey Institute and others, swingers account for two to four percent of married couples with numbers in excess of 4 million people in North America.It may not be possible to trace a precise history of swinging since the modern concept is so closely related to basic human sexuality and relationships, and they vary significantly across time and cultures. The term "swinging" would have no counterpart or meaning in many cultures and civilizations in history who did not value monogamous relationships or have religious or social prohibitions against such sexual practices. It is a historical term that is best understood as fairly modern and Western in its expression As of 2011, some experts believe that there are as many as 15 million Americans swinging on a regular basis. Swinging sexual activity can take place in a sex club, also known as a swinger club (not to be confused with a strip club). Different clubs offer varied facilities and atmospheres, and often hold "theme" nights.Furthermore, many websites such as www.SwingersMeet.com that cater to swinging couples now exist, some boasting hundreds of thousands of members." Local Swingers.