The vast research output of some 6, researchers is published in the world's top journals across the arts and sciences. The new analysis presented estimates for the whole Japanese population, more clearly defined the age and socioeconomic status of people who have never had heterosexual intercourse and compared trends over time. Sex and money Men were more likely to have had intercourse if they had permanent, full-time employment and lived in cities with more than 1 million inhabitants. Experienced but inactive Relevant to the national fertility rate and public health implications but not investigated by the survey are people who have had intercourse in the past, but have since become sexually inactive. The researchers used data from seven surveys conducted between and , each including between 11, and 17, adults aged 18 to 39 years old. The researchers assumed all married adults have had sex.
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