Human male pair bonding and testosterone

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.