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Social Science (br) Chuko Shinsho : "" refers to sexual intercourse with someone other than a spouse. While it is a topic of interest for which celebrities are scooped every week, there is little objective information. Economists and sociologists conducted a comprehensive survey to clarify the overall picture based on research conducted abroad. What percentage of people are experienced, what they want and what they want, how long it lasts and why it ends, what impact it will have on their families, and who makes bussing. We empirically approach themes that tend to be preceded by images.