Related Experiment Video
Updated: Jun 14, 2026

Observation and Quantification of Mating Behavior in the Pinewood Nematode, Bursaphelenchus xylophilus
Published on: December 25, 2016
Sex differences in approaching friends with benefits relationships
Justin J Lehmiller1, Laura E VanderDrift, Janice R Kelly
1Department of Psychology, Colorado State University, Fort Collins, CO 80523-1876, USA. justin.lehmiller@colostate.edu
Men and women show similarities in friends with benefits (FWB) relationships but differ in motivations and future expectations. Men prioritize sex, while women seek emotional connection, with both valuing friendship over sex.
Area of Science:
- Psychology
- Sociology
- Relationship Science
Background:
- Friends with benefits (FWB) relationships are increasingly common.
- Understanding sex differences in FWB dynamics is crucial for relationship research.
Purpose of the Study:
- To investigate sex differences in the initiation, commitment, and future expectations within friends with benefits relationships.
- To explore the influence of traditional gender roles on FWB relationship approaches.
Main Methods:
- An online survey was administered to individuals currently in FWB relationships.
- Data collected included reasons for relationship initiation, commitment levels to friendship and sexual aspects, and future relationship hopes.
Main Results:
- While many similarities exist, significant sex differences were observed.
- Men were more motivated by sex, women by emotional connection.
- Men desired relationship stasis, while women sought romance or platonic friendship.
- Both sexes reported higher commitment to the friendship than the sexual component.
Conclusions:
- Findings suggest traditional gender roles and the sexual double standard influence how men and women navigate FWB relationships.
- Despite differences, a strong commitment to the friendship aspect is common for both sexes.
Related Concept Videos
Relationship Formation
Desirable Characteristics in Others
Relationship Growth
Mate Choice
Friendships and Close Friendships
Criticisms of the Evolutionary Perspective
Evolutionary psychology provides one explanation for these findings, suggesting...

