Journal of Ethology

, Volume 25, Issue 3, pp 223–229 | Cite as

The lower salivary testosterone levels among unmarried and married sexually active men

  • K. Sakaguchi
  • M. Oki
  • S. Honma
  • H. Uehara
  • T. Hasegawa


We examined the influences of regular sexual activity and marital status on salivary testosterone levels in healthy adult Japanese men. Forty-four men (20–66 years) collected their saliva thrice a day (0900–1000, 1300–1400, and 1700–1800). The testosterone levels at each collection time negatively correlated with the ages of the participants; therefore, residual testosterone levels were used for analyses after correcting for age by linear regression. The testosterone-lowering effect of marriage was marginal and the regular sexual activity more strongly associated with lower testosterone levels in morning saliva. The possible neurofeedback systems underlying the phenomenon are discussed.


Marriage Reproductive strategies Testosterone Saliva Sexual activity 



We thank Peter Gray at the University of Nevada for helpful discussions. This research project was supported by a Grant-in-Aid for Scientific Research (C) “Gender” (no. 1611272) and by the JSPS 21st Century COE program “Center for Evolutionary Cognitive Sciences at the University of Tokyo” from the Ministry of Education, Culture, Sports, Science and Technology of Japan.


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Copyright information

© Japan Ethological Society and Springer 2006

Authors and Affiliations

  • K. Sakaguchi
    • 1
  • M. Oki
    • 1
  • S. Honma
    • 2
  • H. Uehara
    • 3
  • T. Hasegawa
    • 1
  1. 1.Hasegawa Lab. Cognitive and Behavioral Science, Graduate School of Arts and SciencesThe University of TokyoTokyoJapan
  2. 2.Teikoku Hormone Manufacturing Co., Ltd.KawasakiJapan
  3. 3.Health Service CenterUniversity of TokyoTokyoJapan

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