{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,28]],"date-time":"2026-09-28T07:57:07Z","timestamp":1790582227853,"version":"4.1.0"},"reference-count":15,"publisher":"Wiley","issue":"9","license":[{"start":{"date-parts":[[2026,9,24]],"date-time":"2026-09-24T00:00:00Z","timestamp":1790208000000},"content-version":"vor","delay-in-days":23,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"},{"start":{"date-parts":[[2026,9,1]],"date-time":"2026-09-01T00:00:00Z","timestamp":1788220800000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Int J of Urology"],"published-print":{"date-parts":[[2026,9]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Objectives<\/jats:title>\n                    <jats:p>To identify latent classes of sexual activity among Japanese adult men using multiple sexual behavior indicators and to investigate their associations with household income.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>This cross\u2010sectional study analyzed data from a 2023 nationwide Internet\u2010based survey of 5 735 Japanese men aged 20\u201379\u2009years. Latent class analysis used six indicators: Sexual intercourse frequency, masturbation frequency, morning erection frequency, and International Index of Erectile Function items 6, 11, and 12. Household income data were available for 4 824 men, who were categorized into low (&lt;\u00a54 million\/year), middle (\u00a54 to &lt;\u00a58 million\/year), or high (\u2265\u00a58 million\/year) income groups.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      Four latent classes were identified: Low desire\/inactive (Class 1, 37.3%), high desire\/non\u2010coital (Class 2, 25.8%), moderate desire\/sexually active (Class 3, 14.7%), and high desire\/high\u2010function active (Class 4, 22.1%). Higher household income was independently associated with Classes 3 and 4, with dose\u2013response relationships, but not with Class 2. The overall income\u2010by\u2010marital\u2010status interaction was significant (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u20090.0004), whereas the class\u2010specific interaction was significant only for Class 3 (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u20090.021) and not for Class 4 (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u20090.255). These post hoc interaction findings were considered exploratory. Sensitivity analyses yielded consistent results.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>Approximately one\u2010quarter of Japanese men belonged to a class characterized by moderate\u2010to\u2010high sexual desire and relatively frequent morning erections despite predominantly little or no intercourse. Household income was associated with intercourse\u2010involving classes but not with Class 2. These findings support a multidimensional assessment of sexual health and warrant further research on socioeconomic factors associated with partnered sexual activity.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1111\/iju.70645","type":"journal-article","created":{"date-parts":[[2026,9,24]],"date-time":"2026-09-24T08:34:56Z","timestamp":1790238896000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Household Income and Sexual Activity Patterns Among Japanese Men: A Latent Class Analysis of a Nationwide Survey"],"prefix":"10.1111","volume":"33","author":[{"ORCID":"https:\/\/orcid.org\/0009-0008-6322-2520","authenticated-orcid":false,"given":"Rie","family":"Yoshimura","sequence":"first","affiliation":[{"name":"Department of Urology Kochi Medical School, Kochi University  Nankoku 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Sayama Sougou Clinic  Saitama Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0003-0328-3042","authenticated-orcid":false,"given":"Atsushi","family":"Nagai","sequence":"additional","affiliation":[{"name":"Management Department of Kawasaki Medical School Hospital  Kurashiki Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Koichi","family":"Nagao","sequence":"additional","affiliation":[{"name":"Department of Urology, Faculty of Medicine Toho University  Tokyo Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1336-4316","authenticated-orcid":false,"given":"Shinichiro","family":"Fukuhara","sequence":"additional","affiliation":[{"name":"Department of Urology Graduate School of Medicine, The University of Osaka  Suita 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