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One longitudinal study of married couples and one experiment tested the hypothesis that the experience of sexual desire for an alternative sexual partner might heighten feelings of desire for one's long-term romantic partner, and conversely, sexual desire for one's long-term partner might heighten desire for alternative partners. A daily-diary study of newlywed couples revealed that (a) on days people reported heightened interest in alternative partners, they also reported increased desire to have sex with their partner and (b) on days people reported heightened desire to have sex with their partner, they also reported increased interest in alternative partners. An experimental study of partnered individuals revealed that people primed with sexual desire for an alternative partner reported increased sexual desire for their romantic partner (relative to a control condition). People primed with sexual desire for their romantic partner, however, did not report increased sexual desire for alternatives. Taken together, these findings support evolutionary perspectives on the function of sexual desire. Findings are consistent with the broader hypothesis that sexual desire is not partner-specific.

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Although prominent theories of intimate relationships, and couples themselves, often conceive of relationships as fluctuating widely in their degree of closeness, longitudinal studies generally describe partners' satisfaction as stable and continuous or as steadily declining over time. The increasing use of group-based trajectory models (GBTMs) to identify distinct classes of change has reinforced this characterization, but these models fail to account for individual differences within classes and within-person variability across classes and may thus misrepresent how couples' satisfaction changes. The goal of the current analyses was to determine whether accounting for these additional sources of variance through growth mixture models (GMMs) alters characterizations of satisfaction changes over time. Applied to longitudinal data from 12 independent studies of first-married couples (combined N = 1,249 couples), GMMs that allowed for class-specific individual differences and within-person variability fit the data better than the GBTMs that constrained these to be equal across classes. Most notably, considerable within-person variability was evident within each class, consistent with the idea that spouses do indeed fluctuate in their satisfaction. Spouses who dissolved their marriages were 3.8-5.7 times more likely to be in classes characterized by greater volatility in satisfaction. Because the early years of marriage appear to be characterized by within-person fluctuations in satisfaction, time-varying correlates of these fluctuations are likely to be at least as important as time-invariant correlates in explaining why some marriages thrive where others falter. (PsycInfo Database Record (c) 2024 APA, all rights reserved).

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Adaptive calibration models suggest that features of people's childhood ecologies can shape their reproductive outcomes in adulthood. Given the importance of dyadic sexual desire (i.e., desire for sex with a partner) for relationships and reproduction, we examined the extent to which people's childhood ecologies-especially the unpredictability of those ecologies-adaptively calibrate such desire. Nevertheless, because female (versus male) sexual desire is presumed to be more sensitive to situational factors, and because hormonal contraceptives alter myriad aspects of female physiology that influence female sexual desire, we predicted that adaptive calibration of dyadic sexual desire would emerge more strongly for naturally cycling females (versus females who use hormonal contraceptives and versus males). In Study 1, a total of 630 participants (159 males, 203 naturally cycling females, and 268 females using hormonal contraceptives) completed questionnaires assessing the harshness and unpredictability of their childhood ecologies as well as their sexual desire. Consistent with predictions, childhood unpredictability (but not harshness) was positively associated with dyadic (but not solitary) sexual desire among naturally cycling females (but not among females using hormonal contraceptives nor among males). Study 2, which consisted of 736 females (307 naturally cycling females, 429 females using hormonal contraceptives), replicated this pattern of results for females. These findings add to a growing literature suggesting that the instability of people's early childhood ecologies can adaptively calibrate their adult reproductive motivations and behaviors, including their dyadic sexual desire. Not only is the current finding among the first to show that some adaptive calibration processes may be sex differentiated, it further highlights that hormonal contraceptives, which alter the evolved reproductive physiology of females, may disrupt adaptive calibration processes (though such disruption may not be inherently negative).

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The height of the COVID-19 pandemic was an exceptionally stressful time for families that offered a unique opportunity to understand how stressful experiences occurring outside the relationship shape behavior occurring inside the relationship. Given the social distancing requirements of the pandemic, however, most research addressing this issue has relied on self-reports of behavior, which are susceptible to bias. In the summer of 2020, we asked a sample of married individuals living in the United States, Canada, Ireland, and the United Kingdom to complete online questionnaires assessing neuroticism and attachment insecurity, their levels of chronic stress, and their levels of acute stress due to the COVID-19 pandemic. We then asked participants to submit a 10-min video of themselves and their spouse attempting to solve an important marital problem that they recorded on their smartphone or other device and uploaded to a secure server. Coders were able to reliably code the behavior of both partners using an established coding system, and the distribution of codes was similar to prior research. Consistent with predictions, participants' COVID-19 stress interacted with their neuroticism and attachment avoidance to predict their levels of oppositional behavior, controlling for their levels of chronic stress and their partner's behavior; neuroticism and attachment avoidance were associated with behaving in a more oppositional manner among participants who reported high but not low COVID-19 stress. Attachment anxiety trended toward predicting more oppositional behavior regardless of stress. These results shed light on how stress affects behavior and introduce a novel way to observe family behavior remotely. (PsycInfo Database Record (c) 2023 APA, all rights reserved).

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Prior research provides mixed evidence regarding the direction of the association between sexual and marital satisfaction. Whereas some studies suggest a bidirectional association, other studies fail to document one direction or the other. The current investigation used a 12-day diary study of 287 married individuals to clarify the nature of this association. Results from time-lagged mixed modeling revealed a significant positive bidirectional association. Both higher global sexual satisfaction one day and satisfaction with sex that occurred that day predicted higher marital satisfaction the next day; likewise, higher marital satisfaction one day significantly predicted higher global sexual satisfaction the next day and higher satisfaction with sex that occurred the next day. Both associations remained significant after controlling for participant's gender/sex, neuroticism, attachment insecurity, self-esteem, stress, perceived childhood unpredictability and harshness, age of first intercourse, construal level, age, and length of marriage. We also explored whether these covariates moderated either direction of the association. Daily stress was the most reliable moderator, with three of the four interactions tested remaining significant after Bonferroni corrections. The bidirectional association between global sexual and marital satisfaction and the positive association between satisfaction with sex that occurred that day and marital satisfaction the next day were significantly stronger when individuals experienced high versus low stress. Although the exploratory nature of all moderation analyses suggests they should be replicated before drawing strong conclusions, these findings highlight the importance of sexual satisfaction to marital satisfaction and vice versa and point to the power of stress in strengthening these associations.

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One challenge many marital couples face is that they experience discrepant levels of sexual desire for one another. Such discrepancies are particularly likely to arise in mixed-sex relationships because, at least in long-term relationships, men tend to have higher levels of sexual desire for their partner than do women. But what underlies this sex difference? We used a dyadic study of 100 mixed-sex community-based newlywed spouses to investigate the role of biological, relational, cognitive, and emotional factors in explaining sex differences in dyadic sexual desire for a long-term partner. Consistent with predictions, wives on average reported lower daily sexual desire for their spouse than did husbands. Moreover, individual differences in men's and women's levels of circulating testosterone explained this sex difference whereas relational (marital satisfaction, commitment), cognitive (sex-role identification, stress, self-esteem), and emotional (mood, depressive symptoms) factors did not. These findings advance our knowledge of factors that influence dyadic sexual desire and may have practical implications for treating relationship distress in mixed-sex marriages.

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Insects are facing a multitude of anthropogenic stressors, and the recent decline in their biodiversity is threatening ecosystems and economies across the globe. We investigated the impact of glyphosate, the most commonly used herbicide worldwide, on bumblebees. Bumblebee colonies maintain their brood at high temperatures via active thermogenesis, a prerequisite for colony growth and reproduction. Using a within-colony comparative approach to examine the effects of long-term glyphosate exposure on both individual and collective thermoregulation, we found that whereas effects are weak at the level of the individual, the collective ability to maintain the necessary high brood temperatures is decreased by more than 25% during periods of resource limitation. For pollinators in our heavily stressed ecosystems, glyphosate exposure carries hidden costs that have so far been largely overlooked.

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OBJECTIVES: Suicidal ideation (SI) nearly always precedes lethal suicide attempts. Anger may play a role in SI, but this appears to vary by gender and nuances in this relationship are unclear. METHOD: We investigated whether levels of (a) anger and (b) SI vary by gender, (c) the cross-sectional relationship between anger and SI, and (d) if gender moderates that relationship in two samples: adults seeking care for excessive anger (Study 1) and undergraduates endorsing previous suicide attempt (Study 2). RESULTS: In Study 1, anger was more commonly endorsed in women; however, in Study 2, anger did not vary by gender. In both studies, SI did not vary by gender. Further, in both studies, anger and SI were positively related. The relationship between anger and SI did not vary by gender in either study. CONCLUSIONS: The strength of the relationship between anger and SI did not vary by gender.

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The behavioral immune system is an evolved adaptation comprised of automatic behavioral, cognitive, and affective reactions that has allowed humans throughout evolutionary history to avoid situations that risk infection by pathogens (e.g., physical proximity to sick people). Although behavioral immune system activation may be functional by helping people avoid such situations, experiencing these automatic reactions during sexual interactions may undermine people's evaluations of those interactions because sex requires close physical contact. We examined whether two sources of behavioral immune system activation (daily concern over contracting COVID-19 and individual differences in infection concern) undermined satisfaction with sex among 318 partnered adults in the U.S. during the COVID-19 pandemic. Participants reported individual differences in perceived infectability and then, every night for two weeks, reported their (a) daily concern about contracting COVID-19, (b) daily stress, (c) whether they had sex with their partner, and (d) their satisfaction with sex when it occurred. People's perceived infectability moderated the association between their daily concern about contracting COVID-19 and the extent to which they enjoyed sex when it occurred, such that people higher, but not lower, in perceived infectability enjoyed sex less on days that they were more worried about contracting COVID-19 than usual. This effect was not moderated by biological sex and remained significant when controlling for biological sex, age, relationship length, and frequency of sex. Results highlight the importance of the behavioral immune system to sexual functioning and suggest a novel avenue through which the COVID-19 pandemic has disrupted relationships.

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OBJECTIVE: Although the mate preference priority model (MPPM) has advanced our understanding of mate preferences, tests of the MPPM have relied on methods using text labels and thus lack ecological validity. We address this gap by testing the MPPM using J. M. Townsend's profile-based experimental paradigm, which utilizes profiles comprising photos of pre-rated models to manipulate physical attractiveness as well as costumes and descriptions to manipulate social status. METHOD: Using Singaporean samples, we conducted two studies (Study 1 n = 431, Study 2 n = 964) where participants judged the short-term and long-term mating desirability of opposite-sex profiles varying systematically on physical attractiveness and social status. We also tested whether treating these attributes as ordinal or continuous variables would be more valid. RESULTS: Results showed broad support for evolutionary predictions of mate preferences and priorities while revealing an increased premium placed on social status in our sample. We also found that continuous operationalizations produced less inflated results. CONCLUSIONS: The current research provides the first non-label, profile-based test of the MPPM, a well-powered replication of the profile-based paradigm, and an opportunity to observe the robustness and variations of mate preferences in a non-Western culture.

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People sometimes hurt those they profess to love; yet our understanding of intimate partner aggression (IPA) and its causes remains incomplete. We examined brain activity using functional magnetic resonance imaging (fMRI) in an ethnically and racially diverse sample of 50 female-male, monogamous romantic couples as they completed an aggression task against their intimate partner, a close friend, and a different-sex stranger. Laboratory and real-world IPA were uniquely associated with altered activity within and connectivity between cortical midline structures that subserve social cognition and the computation of value. Men's IPA most corresponded to lower posterior cingulate reactivity during provocation and women's IPA most corresponded to lower ventromedial prefrontal cortex activity during IPA itself. Actor-partner independence modeling suggested women's IPA may correspond to their male partner's neural reactivity to provocation. Broadly, these findings highlight the importance of self-regulatory functions of the medial cortex and away from effortful inhibition subserved by dorsolateral cortices.

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We pooled data from 10 longitudinal studies of 1,104 married couples to test the Vulnerability-Stress-Adaptation (VSA) model of change in relationship satisfaction. Studies contained both spouses' self-reports of neuroticism, attachment anxiety, and attachment avoidance; observational measures of engagement and opposition during problem-solving discussions at baseline; and repeated reports of both spouses' stress and marital satisfaction over several years. Consistent with the VSA model, all three individual and partner qualities predicted changes in marital satisfaction that were mediated by observations of behavior and moderated by both partners' experiences with stress. In contrast to the VSA model, however, rather than accentuating the association between individual differences and behavior, both partners' stress moderated the strength, and even direction, of the association between behavior and changes in marital satisfaction over time. Taken together, these findings indicate that 1) qualities of both couple members shape their behavioral exchanges, 2) these behaviors explain how individuals and their partners' enduring qualities predict relationship satisfaction, and 3) stress experienced by both couple members strongly determines how enduring qualities and behavior predict changes in relationship satisfaction over time. The complex interplay among both partners' enduring qualities, stress, and behavior helps explain why studies may fail to document direct main effects of own and partner enduring qualities and behavior on changes in relationship satisfaction over time.

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Sex is integral to maintaining a satisfying long-term romantic relationship such as marriage. It is thus important to identify the factors that promote sexual satisfaction in these relationships. To this end, we examined the extent to which a crucial evolved individual difference-sexual disgust sensitivity-impacts people's sexual satisfaction and relationship satisfaction. Using a two-year longitudinal study of 102 newlywed couples (204 individuals), we demonstrated that, rather than exerting main effects, the interaction of both couple members' sexual disgust sensitivities was indirectly associated with marital satisfaction through sexual satisfaction. People whose partners' sexual disgust sensitivities were relatively similar (versus dissimilar) to their own maintained higher levels of sexual satisfaction across the first two years of marriage, which was associated with similarly elevated marital satisfaction. Not only do these findings highlight the importance of integrating evolutionary perspectives and relationship science, they underscore the value of conducting dyadic research to examine the unique intersection of both couple members' characteristics for people's relationship outcomes.

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Do people realize the evaluative feelings that are spontaneously activated by their partner? If so, do they use those evaluations when judging their romantic relationships? To answer these questions, we investigated the association between automatic partner attitudes and judgments of relationship satisfaction in 7 studies. Study 1 was a meta-analysis of 86 correlations that revealed a very weak association between implicitly and explicitly assessed relationship evaluations, and Studies 2a-2c revealed that people failed to accurately report their automatic partner attitudes even when specifically asked to do so. Consistent with the idea that such inaccuracy emerged in part because motivational factors led people to override their automatic attitudes, Studies 3 and 4 demonstrated that automatic partner attitudes better aligned with relationship judgments when people were incentivized with money (Study 3) and had dissolved their relationship (Study 4). Nevertheless, consistent with the idea that overriding automatic attitudes requires the opportunity to deliberate, Studies 4 and 5 demonstrated that automatic partner attitudes better aligned with relationship judgments when people experienced more stress at the daily level (Study 4) and yearly for two years (Study 5). In Study 5, the interaction between stress and automatic attitudes emerged controlling indicators of negativity and was further moderated by relationship enhancing motivations among wives. These studies (a) help explain why automatic partner attitudes predict self-reported relationship satisfaction over time and (b) provide support for theories of social cognition suggesting that people have access to implicitly assessed attitudes that is obscured by motivations and opportunities to deliberate. (PsycInfo Database Record (c) 2021 APA, all rights reserved).

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Sex is a defining feature of marriage with important implications for marital success. Nevertheless, frequency and quality of sex decline across the early years of marriage. Given many modern-day couples in the U.S. are delaying marriage and thus experiencing many traditional aspects of marriage before their nuptials, the current research explored the extent to which premarital factors such as courtship duration, cohabitation, and children are associated with trajectories of couples' sexual relationships during the early years of marriage. Using a 4-year longitudinal study of newlywed couples, results demonstrated that couples with longer (versus shorter) courtships or who did (versus did not) cohabit engaged in less frequent sex at the start of marriage; interestingly, couples with longer (versus shorter) courtships or with (versus without) children prior to marriage experienced less steep declines in frequency of sex over time. Couples who did (versus did not) cohabit were less sexually satisfied initially and over time; couples with longer (versus shorter) courtships experienced less steep declines in sexual satisfaction over time. Notably, each of these associations emerged independent of related individual differences and marital quality. These findings highlight the notion that premarital factors can explain, at least in part, differences in newlywed couples' sexual relationships.

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Although conflict and sex frequently occur in relationships, little research has examined their interconnectedness. Some evidence suggests their co-occurrence can benefit relationships, whereas other evidence suggests the opposite. We sought to clarify such contrasting evidence by conducting a dyadic daily-diary study of 107 newlywed couples that included a 6-month follow-up assessment. Although conflict (operationalized as one partner doing something the other did not like) was unassociated with the likelihood of sex on a given day, it predicted a lower likelihood the following day. Moreover, despite the fact that sex co-occurring with (vs. occurring independent of) conflict was less enjoyable, it partially reduced the negative effects of conflict on both spouses' daily relationship quality. The extent to which sex and conflict co-occurred was unassociated with intimates' changes in marital satisfaction 6 months later. The implications of engaging in post-conflict sex are nuanced: although such sex is less enjoyable, it temporarily buffers relationship quality in that moment.

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Researchers often seek to synthesize results of multiple studies on the same topic to draw statistical or substantive conclusions and to estimate effect sizes that will inform power analyses for future research. The most popular synthesis approach is meta-analysis. There have been few discussions and applications of other synthesis approaches. This tutorial illustrates and compares multiple Bayesian synthesis approaches (i.e., integrative data analyses, meta-analyses, data fusion using augmented data-dependent priors, and data fusion using aggregated data-dependent priors) and discusses when and how to use these Bayesian synthesis approaches to combine studies that compare two independent group means or two matched group means. For each approach, fixed-, random-, and mixed-effects models with other variants are illustrated with real data. R code is provided to facilitate the implementation of each method and each model. On the basis of these analyses, we summarize the strengths and limitations of each approach and provide recommendations to guide future synthesis efforts.

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Women are frequently valued for their sexuality and physical appearance, and there is theoretical reason to believe that the effects of such valuation depend on the context. A robust body of research demonstrates that such valuation from male strangers harms women's self-esteem; the current studies, however, tested whether women experience more positive outcomes when such valuation emerges in the context of their romantic relationships. Study 1 used an event-based diary study to demonstrate that when partners (vs. male strangers) draw attention to women's sexuality and physical appearance, those women report higher appearance esteem and, subsequently, higher self-esteem. Study 2 used data from two independent, longitudinal studies of newlywed couples to demonstrate that partner sexual and physical valuation has positive implications for women's self-esteem over time. These findings highlight that sexual and physical valuation is not inherently beneficial or harmful; rather, the implications of such valuation depend on the relationship context.

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People seek warm and trustworthy individuals as long-term mates for numerous reasons. Indeed, such individuals are prone to cooperation, have strong parenting skills, have the ability to fulfill our need to belong, and may provide a relationship that is characterized by greater closeness, protection, acceptance, and safety. Although prior work has shown that both sexes indicate equally strong preferences for these traits in potential mates, few studies have examined whether people actually respond favorably to partners high in warmth-trustworthiness in live mating contexts. We, thus, demonstrated that people's stated preferences for warmth-trustworthiness (a) predicted their attraction to potential mates in a live mate-selection context (Study 1) and (b) interacted with their partners' actual traits to predict satisfaction with their marriages (Study 2). Together, these studies demonstrate the importance of partner traits associated with warmth and trustworthiness and add to recent research suggesting that people can accurately report their romantic-partner preferences.

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Sex is critical to marriage. Yet, there are several reasons to expect spouses to experience declines in the desire for sex over time, and the rates of any declines in sexual desire may differ for men and women. We used two multi-wave, longitudinal studies to test whether male and female members of newlywed couples experienced different rates of change in sexual desire, whether any such changes were accentuated by childbirth, and whether any such changes had implications for marital satisfaction. In both studies, spouses provided multiple reports of sexual desire, marital satisfaction, and childbirth. Results demonstrated that women's sexual desire declined more steeply over time than did men's sexual desire, which did not decline on average. Further, childbirth accentuated this sex difference by partially, though not completely, accounting for declines in women's sexual desire but not men's. Finally, declines in women's but not men's sexual desire predicted declines in both partners' marital satisfaction. These effects held controlling depressive symptoms and stress, including stress from parenthood. The current findings offer novel longitudinal evidence for sex-differentiated changes in sexual desire and therefore suggest an important source of marital discord.

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