Sexual practice between several people, married or not. Swinging is most often practiced between couples. Occasionally, single males are invited to join the group. Single women, however, are always welcome as there is a greater proportion of bisexual women in society. Human beings, like animals, are excited at listening, seeing or sensing other individual in the act of copulation. In the United States, about five million people practice swinging. Here in Quebec, more precisely in the Montreal area, there are 20 to 25 places available for swingers. These include clubs, hotels, private homes, cruises, movie theaters and bed-and-breakfasts. These places are usually found in the adult section of the classified ads in newspapers or on the Internet. Since many years, the United States has a swinger's association, NASCA (North American Swing Club Association). Here in Quebec, the Swinger's Association, AEQSA, was founded in 2001.