Texas Research Center for Social Dynamics

Study Period: January 2017 – December 2019

Executive Summary

Background. Online dating has become a dominant mode of mate search, with approximately 40% of new relationships beginning digitally. Evolutionary psychologists have long argued that female intrasexual competition, while less physically aggressive than male competition, employs tactics of reputational damage and social exclusion. The anonymity and text‑based nature of online dating profiles may create new avenues for such indirect aggression. Anecdotal reports describe women sabotaging other women’s profiles by posting fake negative reviews, sharing screenshots to ridicule, or, in experimental contexts, giving competitive ratings that undermine a rival’s attractiveness. However, no controlled experiment had directly measured whether women, when placed in a competitive mating scenario, would manipulate or degrade the dating profile of another woman to reduce her desirability.

Objective. The DATE‑COMP trial was a controlled experiment testing whether women, when primed with a mating competition cue, would alter their evaluation of a same‑sex competitor’s dating profile in a way that would harm her mating prospects. Specifically, the study examined whether they would rate the profile as less attractive, less trustworthy, and less intelligent, and whether they would leave publicly visible negative comments.

Methods. From 2017 to 2019, 346 single heterosexual women (aged 21–35, actively using dating apps) were recruited from the Austin area and randomly assigned to one of three conditions: (1) Mating Competition Prime (n = 115): participants viewed a photo of a highly attractive female “potential rival” and were told that the study was about “how women evaluate romantic competitors”; (2) Friendship Prime (n = 115): participants were told the photo was of a potential study partner and the study was about friendship formation; (3) Control (n = 116): no prime, just profile evaluation. All participants then viewed the same online dating profile of a female target (named “Jessica”), which included neutral but flattering photos, a generic but positive bio, and interests. Participants rated the target on a 1–7 scale for attractiveness, trustworthiness, intelligence, and “would I recommend her to a male friend.” They were also offered the chance to leave optional “feedback for Jessica” that was supposedly going to be shared with her (but was actually a measure of overt negative commentary). The primary outcome was an overall Mate Value Score (average of attractiveness and recommendation). Secondary outcomes were the negativity of optional comments (coded by blinded raters) and the trustworthiness and intelligence ratings.

Results. Women in the Mating Competition condition rated the target significantly lower on Mate Value Score (M = 4.1, SD 1.2) compared to Friendship (M = 5.2, SD 1.0) and Control (M = 5.0, SD 1.1; p < 0.001). Trustworthiness ratings were 3.8, 5.1, and 4.9 respectively (p < 0.001), and intelligence ratings were 4.3, 5.0, and 4.8 (p = 0.001). The proportion of participants leaving negative optional comments was 22% in Competition vs. 4% in Friendship and 6% in Control (p < 0.001). Comments included statements like “Seems a bit desperate,” “Photos are probably old,” and “I wouldn’t trust her.” Mediation analysis suggested that the effect on Mate Value Score was driven by a decrease in perceived trustworthiness. There was no effect of participant’s self‑rated attractiveness or age.

Conclusion. In a mating‑competitive context, women systematically devalue the desirability of a same‑sex peer, engaging in subtle reputation sabotage that could directly harm that peer’s romantic prospects. This behavior, though likely not consciously malicious in all cases, represents a modern, digital manifestation of female intrasexual competition. The findings have implications for understanding the social dynamics of online dating and the psychological costs imposed on women by other women’s evaluations.

1. Introduction

Competition for mates is a fundamental evolutionary force. In humans, female mate competition involves not only self‑enhancement (improving one’s own appearance and status) but also competitor derogation—strategies that diminish the perceived value of rivals. While men’s derogation of other men is often direct, women’s derogation is hypothesized to be more indirect and focused on undermining a rival’s reputation, particularly regarding physical appearance and sexual trustworthiness.

The online dating environment heightens the importance of profile‑based first impressions. A woman’s profile is her public advertisement to the mating market, and its success depends on ratings, reviews (where platforms allow), and word‑of‑mouth from both male and female viewers. If other women, particularly potential competitors, downgrade her profile, they may reduce her male attention. Such behavior could be an unconscious or conscious tactic to eliminate rivals. The DATE‑COMP trial tested this by creating an experimentally induced competitive mindset and measuring its effect on profile evaluation.

2. Methods

2.1 Participants and Design

Three hundred forty‑six heterosexual single women (age 21–35, M = 27.4) were recruited via university listservs, social media, and community flyers from January 2017 to December 2019. All were active on at least one dating app. Participants were randomly assigned to one of three conditions in a between‑subjects design. The experiment was conducted online, with participants told they were helping pilot a new dating profile feedback tool. The TRCSD IRB approved the study; all participants provided consent and were debriefed afterward.

2.2 Procedure

In the Mating Competition condition, participants first read a brief “research” statement: “In this study, we are interested in how women evaluate romantic competitors. You will see a photo of another participant who is also single and looking for a relationship.” They then saw a photo of an attractive female (confederate), rated her attractiveness, and proceeded to evaluate the target profile. In the Friendship condition, the priming text said the photo was of a potential study partner, and the study was about friendship formation. In the Control condition, participants proceeded directly to evaluate the target profile without any prime. The target profile was identical across conditions: a woman “Jessica, 27,” with three photos (face, full body, social), a bio saying “Love hiking, coffee, and dogs. Looking for someone genuine,” and standard interests. Participants rated Jessica on Likert scales (1–7) for physical attractiveness, trustworthiness, intelligence, and “Would you recommend her to a single male friend?” They were then asked: “Would you like to leave any feedback for Jessica? (She will see this.)” The feedback box was optional. Ratings of attractiveness, trustworthiness, and intelligence were averaged for a Mate Value Score (Cronbach’s α = 0.82). The primary outcome was this score; the recommendation item was also analyzed separately. Text feedback was coded for negativity (negative, neutral, positive) by two independent raters (κ = 0.88).

2.3 Statistical Analysis

One‑way ANOVA and chi‑square tests were used. Mediation was conducted using bootstrapping (PROCESS macro). Sample size provided 80% power to detect a medium effect (f = 0.25).

3. Results

Groups were equivalent on demographics. The Mate Value Score was significantly lower in the Competition condition (M = 4.1, SD 1.2) than in Friendship (M = 5.2, SD 1.0) and Control (M = 5.0, SD 1.1), F(2, 343) = 30.2, p < 0.001, η² = 0.15. Post‑hoc tests showed Competition < Friendship (p < 0.001) and Competition < Control (p < 0.001); Friendship and Control did not differ (p = 0.31). The recommendation item showed the same pattern. Negative comments were left by 22% of Competition participants vs. 4% in Friendship and 6% in Control (χ² = 28.4, p < 0.001). Mediation analyses revealed that the lower trustworthiness rating mediated the effect of condition on Mate Value Score (indirect effect = −0.38, 95% CI: −0.56 to −0.22), while attractiveness and intelligence did not significantly mediate.

4. Discussion

A simple competitive prime—thinking about a same‑sex rival—led women to devalue another woman’s dating profile, particularly by questioning her trustworthiness. This is consistent with the theory that female intrasexual competition often targets a rival’s reputation, especially regarding sexual fidelity and honesty, traits highly valued by men. In the online environment, where women can influence a competitor’s perceived mate value via ratings and comments, such behavior could have tangible negative consequences for the target’s romantic success.

The results imply that women’s evaluations of each other in mating contexts are not impartial; they are colored by competitive motives. This adds to the literature on “slut‑shaming” and female gossip, showing that even in a controlled, low‑stakes laboratory‑like setting, women will lower a peer’s status when competition is salient. While the behavior is evolutionarily logical, it can cause harm to individual women, contributing to a hostile social environment.

Limitations include the artificial nature of the evaluation and the lack of actual mate choice outcomes. The study did not include male raters, so the impact on men’s perceptions could not be measured. Future research should examine whether this devaluation actually influences male behavior. The sample was limited to one region; cross‑cultural replication would be valuable.

5. Conclusion

Female mating competition manifests in the digital sphere as profile sabotage and trustworthiness attacks on same‑sex rivals. The DATE‑COMP trial demonstrates that these behaviors can be elicited experimentally, confirming a social dynamic in which women can undermine each other’s romantic prospects. The Texas Research Center for Social Dynamics encourages dating platform designers to be aware of potential coordinated female‑female aggression and to build features that limit such manipulation.

6. References

1. Vaillancourt, T., & Sharma, A. (2011). Intolerance of sexy peers: Intrasexual competition among women. Aggressive Behavior, 37(6), 569‑577.
2. Buss, D.M., & Dedden, L.A. (1990). Derogation of competitors. Journal of Social and Personal Relationships, 7(3), 395‑422.
3. Fisher, M., & Cox, A. (2011). Four strategies used during intrasexual competition for mates. Personal Relationships, 18(1), 20‑38.
4. Campbell, A. (2013). The evolutionary psychology of women’s aggression. Philosophical Transactions of the Royal Society B, 368(1631), 20130078.
5. Fink, B., Klappauf, D., Brewer, G., & Shackelford, T.K. (2014). Female physical characteristics and intra‑sexual competition in women. Personality and Individual Differences, 58, 138‑141.
6. Hess, N., & Hagen, E. (2017). Competitive gossip: The evolutionary function of women’s indirect aggression. In M. Fisher (Ed.), The Oxford Handbook of Women and Competition. Oxford University Press.

March 2022