Oxytocin amplifies sex differences in human mate choice

Area of Science:

• Psychology
• Neuroscience
• Evolutionary Biology

Background:

• Infidelity is a primary driver of relationship dissolution.
• Individuals with a history of infidelity often repeat such behaviors.
• Past infidelity may signal opportunities for short-term sexual relationships.

Purpose of the Study:

• To investigate sex-dependent effects of oxytocin on attraction and mate choice.
• To examine preferences for faithful versus unfaithful partners in short-term and long-term contexts.
• To understand oxytocin's role in modulating relationship priorities during courtship.

Main Methods:

• A pre-registered, double-blind study was conducted with 160 participants.
• Participants rated the attractiveness and likeability of individuals with varying infidelity histories.
• Oxytocin administration was administered to assess its effects on attraction and relationship interest.

Main Results:

• Both sexes preferred faithful individuals for relationships, but men showed more interest in short-term relationships with unfaithful individuals than women.
• Oxytocin administration increased men's attraction to and likeability ratings of unfaithful women.
• Oxytocin administration decreased women's attraction to and memorability of unfaithful men, while increasing interest in long-term relationships with faithful men.

Conclusions:

• Oxytocin influences sex-specific attraction and mate choice priorities during courtship.
• These effects may precede oxytocin's role in promoting romantic bonding.
• Understanding these mechanisms is crucial for comprehending relationship dynamics and infidelity patterns.