Evidence of assortative mating for Theory of Mind via facial expressions but not language

Assortative mating (AM) is a phenomenon in which romantic partners typically resemble each other at a level greater than chance. There is converging evidence that social behaviours are subject to AM, though less is known regarding social cognition. Social functioning requires the ability to identify and understand the mental states of others, i.e., Theory of Mind (ToM). The present study recruited a sample of 102 heterosexual couples via an online survey to test if ToM as measured using facial expressions (Reading the Mind in the Eyes Test) or language (Stiller-Dunbar Stories Task) is associated with AM. Results showed existence of AM for ToM via facial expressions, though no such effect for ToM via language. AM for ToM via facial expressions was not moderated by length of relationship nor by partner similarity in age, educational attainment, or religiosity, all variables relevant to social stratification. This suggests AM for ToM via facial expressions is better explained by partners being alike at the start of their relationship (initial assortment) rather than becoming similar through sustained social interaction (convergence), and by people seeking out partners that are like themselves (active assortment) rather than simply pairing with those from similar demographic backgrounds (social homogamy).

But What’s Your Partner up to? Associations between Relationship Quality and Pornography Use Depend on Contextual Patterns of Use within the Couple

It is commonly assumed that pornography use harms relationships. In the current research, we contribute to a small but growing body of work that challenges this assumption by examining an alternative explanatory mechanism for the associations between pornography use and relationship dysfunction. In contrast to dominant exposure-based explanations in this field, we argue instead that the apparent negative “impact” of pornography use on relationship quality may be the product of partner similarity or differences in pornography use behavior. Independent of any direct causal effect of sexual media, we would expect that negative relationship functioning should be more prominent among couples who are dissimilar in their pornography use, because dissimilarity in this behavior suggests broader dissimilarity in sexual interests, preferences, and values. To this end, we sought to test whether dyadic patterns of pornography use, and related attributes, were associated with sexual and relationship satisfaction in two cross-sectional (N = 407; n1 = 200; n3 = 207) and two longitudinal (N2 = 77; N4 = 529) samples of heterosexual couples. Across studies, results indicated that shared pornography use and partner similarity in solitary pornography use relative to dissimilarity in solitary pornography use were both associated with better sexual satisfaction and to a lesser extent, relationship satisfaction. Further consideration of potential explanatory mechanisms for these associations established comparable patterns of results for similarity-dissimilarity in attitudes towards pornography, erotophobia-erotophilia, sexual preferences, and sex drive. Importantly, only similarity-dissimilarity in sex drive statistically accounted for the effects of similarity-dissimilarity in solitary pornography use. These findings demonstrate that links between pornography use and relationship health are partially a function of different dyadic patterns of pornography use within couples, a pattern of results that is difficult to account for with traditional exposure-based theories of the impact of pornography.

The Influence of Demographic, Relational, and Risk Asymmetries on the Frequency of Intimate Partner Violence in Young Adulthood

Social characteristics are prominent factors in mate selection, but they are also important for the quality and functioning of intimate relationships. Researchers have shown that the intimate relationships that are considered the most successful often have high levels of partner similarity. Yet this prior work is limited, as it largely focuses on demographic differences (or asymmetries) between intimate partners. In addition to demographic asymmetries, we explored how differences in relational and risk behaviors were associated with intimate partner violence (IPV). Examining data from the Toledo Adolescent Relationships Study ( n = 828), we found that young adults in relationships with demographic, relational, and risk asymmetries reported greater frequency of violence. Furthermore, we found that asymmetries in risk behavior had the strongest association with IPV. These findings highlighted the importance of considering different types of asymmetries and provided new insight into the functioning of young adult relationships.

Partners in health? Investigating social genetic effects for married and cohabiting couples

Abstract‘Social contagion’ research suggests that health behaviors (BMI, smoking, drinking, etc.) spread through social networks, including dyadic ties such as between married/cohabiting partners. However, separating contagion from assortative mating (‘like seeks like’) and shared environmental factors remains notoriously difficult in observational studies. It is not possible to obtain exogenous variation in long-term partnerships (‘random mating’), but genetic approaches can offer a novel way to examine partner similarity and the role of social contagion. This paper explores possible social genetic effects among partners, i.e., effects of the partner’s genes on one’s own behavior. We use the longitudinal Health and Retirement Study with data on health behavior and genomic data for both ego and his/her partner to examine social genetic effects for BMI, drinking, and smoking behavior. For each outcome, we find support for social genetic effects. Americans of European descent were more overweight if they had partners with higher polygenic scores for BMI net of their own polygenic score. Similar findings were found for the number of drinks per week and cigarettes per day. Longitudinal analyses that conditioned on past health behavior of both spouses confirmed these findings. We further explored whether susceptibility to the partner’s influence differed between men and women, but did not find consistent differences across outcomes. Findings are further discussed in the light of ramifications of social genetic effects for the social and biological sciences.

Consistency between individuals' past and current romantic partners' own reports of their personalities

Do people have a “type” when it comes to their romantic partners’ personalities? In the present research, we used data from a 9-y longitudinal study in Germany and examined the similarity between an individual’s ex- and current partners using the partners’ self-reported personality profiles. Based on the social accuracy model, our analyses distinguished similarity between partners that was attributable to similarity to an average person (normative similarity) and resemblance to the target participant himself/herself (self-partner similarity) to more precisely examine similarity from partner to partner (distinctive similarity). The results revealed a significant degree of distinctive partner similarity, suggesting that there may indeed be a unique type of person each individual ends up with. We also found that distinctive partner similarity was weaker for people high in extraversion or openness to experience, suggesting that these individuals may be less likely to be in a relationship with someone similar to their ex-partner (although the individual difference effects were not mirrored in an alternative analytic approach). These findings provide evidence for stability in distinctive partner personality and have important implications for predicting future partnering behaviors and actions in romantic relationships.

Higher well-being with similar partner? Testing the similarity hypothesis for socio-demographic characteristics

Studies on marriage and divorce often assume, explicitly or implicitly, that there is a positive relationship between partner similarity and well-being. We test this similarity hypothesis: do individuals who share more socio-demographic characteristics with their partners report higher well-being than individuals whose partners are less similar? We analyzed information on more than 2,300 married and cohabiting couples aged 18-50 from the UK Understanding Society wave 1 survey. Three dimensions of well-being were assessed: relationship quality, life satisfaction and psychological distress. We examined similarity on seven characteristics separately and as an index of similarity: age, father’s class, education, ethnicity, religiosity, native language, and parental divorce. The results provided no support for the similarity hypothesis: there was no evidence for a positive association between partner similarity and the three well-being measures. We discuss the implications of this finding for our understanding of partner choice and divorce.

The impact of partner similarity on alliance management capability, stability and performance

Purpose The purpose of this paper is to investigate significant impact of partner similarity on the success of horizontal alliances in logistics service providers (LSPs) from China. Design/methodology/approach Primary data were collected via questionnaire distribution to 380 Chief Executive Officers and Managing Directors in 262 small and medium logistics enterprises in China. There are 316 valid questionnaires for further analysis with 83 percent accuracy in response rate. Structural equation modeling was used to test the impact of partner similarity on alliance management capability, stability and performance. Findings Partner similarity and logistics alliance management capability (LAMC) are positively correlated to alliance stability and performance in horizontal alliances among Chinese LSPs, especially competence similarity and cultural similarity. Moreover, alliance stability mediates the impact of partner similarity and LAMC on alliance performance. Research limitations/implications The basic limitation of this research is to collect data just from small and medium logistics enterprises that operate in China with sample size (n=316). This research could further be extended to other regions in China or other countries. Practical implications This research verifies the positive relationship between partner fit and management capability. Besides, based on research findings, the research proposes guidelines for LSPs pursuing horizontal alliances Originality/value This research proposes an experimental model for Chinese LSPs to cooperate successfully and build horizontal alliances in order to increase their effective customer response capability.