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Combining Behavioral Endocrinology and Experimental Economics: Testosterone and Social Decision Making
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Human male pair bonding and testosterone.

Peter B Gray1, Judith Flynn Chapman2, Terence C Burnham2

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Men in committed relationships show lower testosterone levels, especially later in the day. Early relationship stages may temporarily increase testosterone in men, suggesting a link to mating effort.

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Area of Science:

  • Evolutionary Psychology
  • Human Reproductive Endocrinology

Background:

  • Prior North American research links committed male relationships to reduced testosterone (T).
  • This study investigates T levels in relation to relationship status and timing in undergraduate men.

Purpose of the Study:

  • To test if men in committed relationships have lower T levels than unpartnered men.
  • To examine if T level differences are more pronounced later in the day.
  • To explore T level variations based on relationship experience and duration.

Main Methods:

  • Salivary testosterone (T) levels were measured in 107 undergraduate men.
  • Participants completed questionnaires on relationship status and experience.
  • Saliva samples were collected at various times throughout the day.

Main Results:

  • Men in committed relationships exhibited lower T levels, particularly in samples collected later in the day.
  • Unpartnered men with no prior relationship experience had lower T levels than experienced men.
  • Men in relationships under six months showed higher T levels than unpartnered men and those in longer relationships.

Conclusions:

  • Male testosterone levels may reflect the allocation of behavioral effort towards mating.
  • Relationship status and duration are associated with significant variations in male T levels.
  • Circadian rhythms and relationship dynamics influence male testosterone concentrations.