Sexual Tension
The Face That Launched a Thousand Ships: The Mating-Warring Association in Men
Lei Chang et al.
Personality and Social Psychology Bulletin, forthcoming
Abstract:
Questions about origins of human warfare continue to generate interesting theories with little empirical evidence. One of the proposed explanations is sexual selection theory. Within and supportive of this theoretical framework, the authors demonstrate a mating-warring association among young heterosexual men in four experiments. Male, but not female, participants exposed to attractive, as compared to unattractive, opposite-sex photographs were significantly more likely to endorse war-supporting statements on a questionnaire. The same mating effect was not found in answering trade conflict questions. Male participants primed by attractive faces or legs of young women were significantly faster in responding to images or words of war than those primed by unattractive faces or national flags. The same mating effect was not found in responding to farming concepts or general aggression expressions. Results underscore the link between mating and war, supporting the view that sexual selection provides an ultimate explanation for the origins of human warfare.
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Diana Fleischman & Daniel Fessler
Hormones and Behavior, February 2011, Pages 271-275
Abstract:
In the human menstrual cycle, luteal phase immunomodulation prevents the maternal immune system from attacking the half-foreign blastocyst should conception occur, thereby facilitating implantation and development. However, tolerance of the conceptus comes at the cost of increased vulnerability to infection. The compensatory behavioral prophylaxis hypothesis (Fessler, 2001; Fessler & Navarrete, 2003) holds that evolved psychological mechanisms enhance avoidance of potential contaminants during periods of reproductive immunomodulation so as to decrease the likelihood of infection. Because such immunomodulation is triggered by progesterone, this hormone is predicted to correspondingly enhance behavioral prophylaxis and the motivational states underlying it. We investigated specific domains of disease avoidance psychology in a nonclinical sample of women (n = 120) by measuring salivary progesterone in naturally cycling women. We find that progesterone correlates directly with the degree to which women report emotions, thoughts, and behaviors consonant with enhanced prophylaxis.
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Testosterone and Self-Reported Dominance Interact to Influence Human Mating Behavior
Richard Slatcher, Pranjal Mehta & Robert Josephs
Social Psychological and Personality Science, forthcoming
Abstract:
In this study, 76 men came into the lab in pairs and engaged in a 7-minute videotaped mate competition for the attention of an attractive female confederate. Pre-competition testosterone (T) levels were positively associated with men's dominance behaviors and with how much the confederate indicated that she "clicked" with each participant. Dyadic analyses showed that self-reported dominance moderated the effects of T on one's own dominance behaviors and on opponents' dominance behaviors. Specifically, among men high in self-reported dominance, there was a strong positive association between T and their own dominance behaviors and a strong negative association between T and opponents' dominance behaviors. However, among men low in self-reported dominance, there was no association between T and dominance behaviors. These findings provide novel evidence linking T with evolutionarily adaptive behaviors in humans and suggest that T interacts with people's explicit dominance motives to regulate behaviors that enhance mating success.
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Short-Term Prospective Study of Hooking Up Among College Students
Jesse Owen, Frank Fincham & Jon Moore
Archives of Sexual Behavior, April 2011, Pages 331-341
Abstract:
Hook ups are casual sexual encounters (ranging from kissing to intercourse) between two people with no clear mutual expectation of further interactions or a committed relationship. This study utilized a short-term prospective design to examine predictors of hooking up in a sample of young adults (N = 394). Hooking up over the past year, positive reactions to prior hook ups, alcohol use, and loneliness were associated with hooking up over a 4-month period. Alcohol use was a stronger predictor for women than men. Thoughtfulness about relationship transitions and religiosity were significant predictors of hooking up in univariate analyses, but were not significant in multivariate analyses. Young adults who reported more depressive symptoms and feelings of loneliness at Time 1 and subsequently engaged in penetrative hook ups reported fewer depressive symptoms and lower feelings of loneliness at Time 2 as compared to young adults who did not hook up. However, young adults who reported fewer depressive symptoms and were less lonely at Time 1 and engaged in penetrative hook ups over the 4 month period reported more depressive symptoms and greater feelings of loneliness at Time 2 as compared to young adults who did not hook up. Implications for relationship education programs are offered.
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Class Differences in Cohabitation Processes
Sharon Sassler & Amanda Miller
Family Relations, April 2011, Pages 163-177
Abstract:
Despite the burgeoning cohabitation literature, research has failed to examine social class variation in processes of forming and advancing such unions. Drawing upon in-depth interviews with 122 working- and middle-class cohabitors, we examine the duration between dating and moving in together, reasons for cohabiting, and subsequent plans. Transitions to cohabitation are more rapid among the working class. Respondents often cohabited for practical reasons - out of financial necessity, because it was convenient, or to meet a housing need. Regardless of social class status, few couples move in together as a "trial marriage." Nonetheless, middle-class cohabitors were more likely to have become engaged than their working-class counterparts. Our findings indicate the need to reassess common beliefs regarding the role served by cohabitation and suggest that cohabitation has become another location where family outcomes are diverging by social class.
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Amy Bilderbeck et al.
Biological Psychiatry, forthcoming
Background: Close supportive relationships protect against psychological disorders and also facilitate recovery. However, little is known about the neurochemical mechanisms that mediate these effects. Variation in serotonin function influences affiliative behavior in humans and nonhuman primates. Here, we used tryptophan depletion in healthy adults to investigate the role of serotonin in the cognitive appraisal of close personal relationships.
Methods: Twenty-two healthy adults drank an amino acid drink without tryptophan, and 19 healthy adults drank an amino acid drink containing tryptophan. Participants were presented with color photographs of heterosexual "couples" standing apart or making affiliative touch gestures and rated the couples for descriptors that capture qualities of close personal relationships. Trait attachment style and state affect of participants were also measured.
Results: Tryptophan depletion reduced the judged intimacy and romance of photographed couples. Tryptophan-depleted women rated men as more dominant in relationships and touching couples as more able to resolve their conflicts, when compared with nondepleted women. These effects were not due to changes in mood and remained statistically reliable when the marked impact of attachment style upon relationship judgments was statistically controlled.
Conclusions: Our results suggest that central serotonin activity influences the appraisal of close intimate partnerships, raising the possibility that serotonergic dysfunction contributes to altered cognitions about relationships in psychiatric illnesses.
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Richard Gilbert, Nora Murphy & Clementina Ávalos
Cyberpsychology, Behavior, and Social Networking, forthcoming
Abstract:
The present study compared communication patterns and satisfaction levels between three-dimensional (3D) and real-life intimate relationships using a sample of 71 participants who were concurrently involved in an intimate relationship within Second Life and a separate real-life romantic relationship. Participants indicated that the quality of their communication was significantly better in their Second-Life relationship and that they experienced higher levels of satisfaction with their virtual partners. The more positive or idealized view of the 3D relationships may have been due to higher levels of focused interaction and reduced stressors in the virtual world and the greater length, and associated problems, in participant's real-life relationships. In addition, the presence of a concurrent relationship within Second Life could have negatively affected participant's judgments of their real-life relationships. These data offer the first detailed assessment of communication patterns and satisfaction levels in intimate relationships across the real and 3D virtual realms as the number of users and romantic partners in immersive virtual environments continue to grow.
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Young Adults' Emotional Reactions After Hooking Up Encounters
Jesse Owen & Frank Fincham
Archives of Sexual Behavior, April 2011, Pages 321-330
Abstract:
Hooking up or a sexual encounter ranging from kissing to intercourse that occurs on one occasion and where the partners do not necessarily expect future physical encounters or a committed relationship has become common place among college students. This study (N = 500) examined gender differences in emotional reactions after hooking up and explored the relationship between specific processes in the hooking up encounter and reactions to hooking up. Compared to women, men reported more positive and fewer negative emotional reactions; however, both men and women reported that the experience was largely more positive than negative. Coital hook ups were associated with fewer negative emotional responses for men as compared to women who engaged in coital and non-coital hook ups and to men who engaged in non-coital hook ups. For those who engaged in coital hook ups, women reported that condom use was associated with fewer positive and more negative emotional reactions whereas condom use was related to fewer negative emotion reactions for men. Negative emotional reactions were also related to reports of depressive symptoms and feelings of loneliness; however, feelings of loneliness were not related to negative emotional reactions after accounting for young adults' positive emotional reactions. Positive emotional reactions were related to hope for and discussion of a committed relationship. Implications for relationship education and future research are outlined.
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Financial Issues and Relationship Outcomes Among Cohabiting Individuals
Jeffrey Dew
Family Relations, April 2011, Pages 178-190
Abstract:
Few studies have examined how financial relationship issues are associated with cohabiting individuals' risk of union dissolution or marriage. Competing-risks Cox regressions using the cohabiting data in the National Survey of Families and Households (N = 483) found that financial disagreements predicted union dissolution, whereas disagreements about housework, spending time together, sex, and parents did not. Perceived unfairness in finances also predicted union dissolution. Although perceived housework unfairness also positively predicted dissolution, this effect was moderated by gender. Interestingly, neither financial issues nor the other normative problems predicted the likelihood of marriage. These findings suggest that the relationship problems associated with financial issues are particularly salient to cohabiting individuals' decision to end their unions.
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Reproductive behavior and personality traits of the Five Factor Model
Markus Jokela et al.
European Journal of Personality, forthcoming
Abstract:
We examined associations between Five Factor Model personality traits and various outcomes of reproductive behavior in a sample of 15 729 women and men from the Wisconsin Longitudinal Study (WLS) and Midlife Development in the United States (MIDUS) survey. Personality and reproductive history was self-reported in adulthood (mean age: 53 years). High extraversion, high openness to experience, and low neuroticism were associated with larger number of children in both sexes, while high agreeableness and low conscientiousness correlated with larger offspring number in women only. These associations were independent of marital status. There were also more specific associations between personality and timing of childbearing. The findings demonstrate that personality traits of the Five Factor Model are systematically associated with multiple reproductive outcomes.
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Stephanie Madsen & Andrew Collins
Journal of Research on Adolescence, forthcoming
Abstract:
Conceptual links between aspects of adolescents' dating experiences (i.e., involvement and quality; ages 15-17.5) and qualities of their romantic relationships in young adulthood (ages 20-21) were examined in a prospective longitudinal design. Even after accounting for earlier relationship experiences with parents and peers, aspects of adolescent dating experiences predicted romantic relationship qualities in young adulthood. Adolescents who dated fewer partners in mid-adolescence and who experienced a better quality dating relationship at age 16 demonstrated romantic partner interactions characterized by smoother relationship process in young adulthood (e.g., negotiating conflict to mutual satisfaction, effective and timely caregiving/seeking); adolescents who dated more partners in mid-adolescence displayed greater negative affect in romantic partner interactions in young adulthood.
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Ready, Set, Go: African American Preadolescents' Sexual Thoughts, Intentions, and Behaviors
Kim Miller et al.
Journal of Early Adolescence, forthcoming
Abstract:
Understanding of preadolescent sexuality is limited. To help fill this gap, we calculated frequencies, percentages, and confidence intervals for 1,096 preadolescents' reports of sexual thoughts, intentions, and sexual behavior. Cochran-Armitage trend tests accounted for age effects. Findings show that 9-year-olds are readying for sexual activity, with sexual readiness increasing between ages of 9 and 12. Sexual thoughts increased with age (p < .001): 46% of 9-year-olds and 70% of 12-year-olds were ready to learn about sex, and 14% of 9-year-olds and 41% of 12-year-olds thought about having sex. Few 9-year-olds anticipated sexual debut, but this increased with age (p < .05): 25% of 12-year-olds were ready for sex, and 20% anticipated initiating sex within a year. Our results indicate that preadolescents are initiating dating relationships and anticipating intercourse, and some have engaged in risk behaviors. Thus preadolescence is a critical time to implement prevention programs.
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Helen Koo et al.
Sex Education, February 2011, Pages 27-46
Abstract:
US adolescents initiate sex at increasingly younger ages, yet few pregnancy prevention interventions for children as young as 10-12 years old have been evaluated. Sixteen Washington, DC schools were randomly assigned to intervention versus control conditions. Beginning in 2001/02 with fifth-grade students and continuing during the sixth grade, students completed pre-intervention and post-intervention surveys each school year. Each year, the intervention included 10-13 classroom sessions related to delaying sexual initiation. Linear hierarchical models compared outcome changes between intervention and control groups by gender over time. Results show the intervention significantly decreased a rise over time in the anticipation of having sex in the next 12 months among intervention boys versus control boys, but it had no other outcome effects. Among girls, the intervention had no significant outcome effects. One exception is that for both genders, compared with control students, intervention students increased their pubertal knowledge. In conclusion, a school-based curriculum to delay sexual involvement among fifth-grade and sixth-grade high-risk youths had limited impact. Additional research is necessary to outline effective interventions, and more intensive, comprehensive interventions may be required to counteract adverse circumstances in students' lives and pervasive influences toward early sex.
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"Sexting" and adult romantic attachment
Robert Weisskirch & Raquel Delevi
Computers in Human Behavior, forthcoming
Abstract:
"Sexting" refers to sending and receiving sexually suggestive images, videos, or texts on cell phones. As a means for maintaining or initiating a relationship, sexting behavior and attitudes may be understood through adult attachment theory. One hundred and twenty-eight participants (M = 22 and F = 106), aged 18-30 years, completed an online questionnaire about their adult attachment styles and sexting behavior and attitudes. Attachment anxiety predicted sending texts that solicit sexual activity for those individuals in relationships. Attachment anxiety also predicted positive attitudes towards sexting such as accepting it as normal, that it will enhance the relationship, and that partners will expect sexting. Sexting may be a novel form for expressing attachment anxiety.
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Is the Internet Filling the Sexual Health Information Gap for Teens? An Exploratory Study
Rachel Jones & Ann Biddlecom
Journal of Health Communication, February 2011, Pages 112-123
Abstract:
At the same time that there was a decline in comprehensive school-based sex education, adolescents' use of the Internet became nearly universal. This study explores adolescents' use and evaluation of the Internet for sexual health information, with a focus on the issues of contraception and abstinence. The authors conducted 58 in-depth interviews with juniors and seniors in 3 public high schools in New York City and Indiana. Most of the adolescents used the Internet on a daily basis, but few considered it a main source of information about contraception or abstinence. Students were more likely to rely on and had greater trust in traditional sexuality education sources such as school, family members, and friends. Most of the adolescents the authors interviewed were wary of sexual health information on the Internet, and the authors describe strategies adolescents used to sort through the abundance of sex-related material. Formal and informal efforts to provide sexuality education to adolescents should include specific age- and content-appropriate Web sites because many teens are not actively searching on their own, and they express reservations about relying on the Internet as a source of sexual health information.
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Brothers delay menarche and the onset of sexual activity in their sisters
Fritha Milne & Debra Judge
Proceedings of the Royal Society: Biological Sciences, 7 February 2011, Pages 417-423
Abstract:
The higher costs of sons compared with daughters extends to a negative effect of brothers on the lifetime reproductive success of their siblings in subsistence and preindustrial societies. In societies with fewer resource constraints, one might expect that these effects would be limited or non-existent. This study investigates the costs of brothers and sisters in a contemporary western society of adult Australians. Girls with elder brothers had a delayed age at menarche. Younger brothers were associated with delayed onset of sexual activity in sisters, but not in brothers. Neither younger nor elder brothers influenced fitness parameters (number of pregnancies, number of children, age at first pregnancy or age at first birth) in siblings of either sex. This study provides evidence that brothers negatively affect their sisters' onset of reproductive maturity and sexual activity; however, this delay is not associated with a fitness cost in contemporary Australia. We suggest this is due to the long period of independence prior to child bearing.
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Age of Menarche and Psychosocial Outcomes in a New Zealand Birth Cohort
Joseph Boden, David Fergusson & John Horwood
Journal of the American Academy of Child & Adolescent Psychiatry, February 2011, Pages 132-140
Objective: This study examined associations between age of menarche and psychosocial outcomes in early adulthood, including sexual behavior, mental health, criminal behavior, and education/employment, to identify the possible causal role of earlier age of menarche in increasing risks of adverse outcomes.
Method: Data were gathered from 497 female members of a New Zealand longitudinal birth cohort. Outcome measures (to age 18 years) were as follows: pregnancy; sexually transmitted infection (STI); DSM-IV major depression, anxiety disorder, alcohol dependence and conduct disorder/ASPD; self-reported crime; convictions; leaving school without qualifications; and unemployment. Associations between age of menarche and outcome measures were then adjusted for confounding factors spanning family background, family functioning, and individual factors. Additional analyses examined sexual behavior outcomes to age 21, and all other outcomes to age 30 years.
Results: Analyses showed that sexual behavior outcomes (pregnancy, STI) were significantly associated with age of menarche, even after controlling for confounding factors. Anxiety disorder was marginally (p < .10) associated with age of menarche. In addition, pregnancy during ages 18 to 21 years was significantly associated with age of menarche. There were no significant associations between age of menarche and outcomes at any other age (to age 30).
Conclusions: The study showed that females reaching menarche at an earlier age were at increased risk of early pregnancy, and STI by age 18. The present study found little evidence to suggest that age of menarche was related to mental health, criminal behavior, or education/employment outcomes for this cohort.
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Assortative mating in morningness-eveningness
Christoph Randler & Stefanie Kretz
International Journal of Psychology, April 2011, Pages 91-96
Abstract:
Individuals differ in their morningness-eveningness preference (circadian preference); that is, some prefer morning hours for intellectual and physical activities and others prefer late afternoon or evening hours. This has been viewed as an interesting facet of personality. Assortative mating has been studied in personality research, but assortative mating in circadian preference has rarely been examined. Eighty-four couples participated in this study. They filled in the Composite Scale of Morningness; they also supplied data about rise times and bedtimes as well as information about relationship satisfaction and duration. The results revealed a moderate positive relationship between couple partners in morningness-eveningness which persisted after correcting for age. Similarly, correlations existed between the sleep-wake variables (rise time and bedtime) on weekdays and on the weekends, the association being higher for weekends. There was no significant correlation between length of the relationship and dissimilarity in morningness-eveningness, suggesting that the above-reported correlations reflect an initial assortment rather than convergence effects. Further, no significant correlation was found between dissimilarity in morningness-eveningness and relationship satisfaction. The results suggest that assortative mating in morningness-eveningness is likely and is probably based on an initial assortment. The likelihood to meet and mate may also be linked to chronotype. When differences in circadian preferences exist between possible partners, this reduces the likelihood that these persons meet either by accident or during work and leisure activities. Therefore, two extreme chronotypes are unlikely to meet each other because they have the smallest overlap in their preferred active time during the day due to the circadian rhythmicity.
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Jacinda Dariotis et al.
Perspectives on Sexual and Reproductive Health, March 2011, Pages 51-59
Context: Racial and ethnic health disparities are an important issue in the United States. The extent to which racial and ethnic differences in STDs among youth are related to differences in socioeconomic characteristics and risky sexual behaviors requires investigation.
Methods: Data from three waves of the National Survey of Adolescent Males (1988, 1990-1991 and 1995) were used to examine 1,880 young men's history of STDs and their patterns and trajectories of sexual risk behavior during adolescence and early adulthood. Multinomial and logistic regression analyses were conducted to test whether racial and ethnic differences in STDs are due to the lower socioeconomic status and higher levels of risky sexual behavior among minority groups.
Results: Young black men reported the highest rates of sexual risk and STDs at each wave and across waves. Compared with white men, black and Latino men had higher odds of maintaining high sexual risk and increasing sexual risk over time (odds ratios, 1.7-1.9). In multivariate analyses controlling for socioeconomic characteristics, black men were more likely than white men to have a history of STDs (3.2-5.0); disparities persisted in analyses controlling for level of risky sexual behavior.
Conclusions: Race and ethnicity continue to differentiate young black and Latino men from their white peers in terms of STDs. Prevention programs that target different racial and ethnic subgroups of adolescent men and address both individual- and contextual-level factors are needed to curb STD incidence.