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PubMed2006

Rethinking the associations between television viewing and adolescent sexuality development: bringing gender into focus.

PURPOSE: To investigate associations between adolescents' television viewing, their sexual behavior, and their perceptions of having power and control in sexual situations (i.e., sexual agency). This study incorporates results from a recent content analysis of television and attends to the different motives for and consequences of girls' and boys' sexual and relational behavior. METHODS: Adolescents (n = 703) aged 11 to 17 years from two public school districts in the Northeastern United States completed surveys assessing their television habits and sexual experiences. Survey data were combined with two content analyses, which assessed the frequency of sexual talk and behavior and the prevalence of gendered messages about sexuality (i.e., the Heterosexual Script) on primetime network television. RESULTS: Adolescents' sexual behavior and feelings of sexual agency were not associated with viewing sexual talk and sexual behavior on television, but were related to viewing the Heterosexual Script, particularly among girls. Girls who saw sexually objectified women and portrayals of men avoiding commitment more often reported less sexual agency. Girls who saw women acting as sexual gatekeepers more often were less sexually experienced and reported more sexual agency. Boys who saw men actively asserting their sexuality more often were less sexually experienced. CONCLUSIONS: The relationship between adolescents' television viewing and sexual experiences depends on the type of sexual messages viewed, the sexual outcome considered, and the gender of the viewer. Parents and practitioners should learn to identify the Heterosexual Script on television and encourage young people to negotiate sexual encounters in safe and positive ways.

Adolescent↗

PubMed2006

Social anxiety and romantic relationships: the costs and benefits of negative emotion expression are context-dependent.

In general, expressing emotions is beneficial and withholding emotions has personal and social costs. Yet, to serve social functions there are situations when emotions are withheld strategically. We examined whether social anxiety influenced when and how emotion expressiveness influences interpersonal closeness in existing romantic relationships. For people with greater social anxiety, withholding the expression of negative emotions was proposed to preserve romantic relationships and their benefits. We examined whether social anxiety and emotion expressiveness interacted to predict prospective changes in romantic relationship closeness over a 12-week period. For people with less social anxiety, relationship closeness was enhanced over time when negative emotions were openly expressed whereas relationship deterioration was found for those more likely to withhold emotions. The reverse pattern was found for people with greater social anxiety such that relationship closeness was enhanced over time for those more likely to withhold negative emotions. Related social anxiety findings were found for discrepancies between desired and actual feelings of closeness over time. Findings were not attributable to depressive symptoms. These results suggest that the costs and benefits of emotion expression are influenced by a person's degree of social anxiety.

Adolescent↗

PubMed2005

Strategic mating with common preferences.

We present a two-sided search model in which individuals from two groups (males and females, employers and workers) would like to form a long-term relationship with a highly ranked individual of the other group, but are limited to individuals who they randomly encounter and to those who also accept them. This article extends the research program, begun in Alpern and Reyniers [1999. J. Theor. Biol. 198, 71-88], of providing a game theoretic analysis for the Kalick-Hamilton [1986. J. Personality Soc. Psychol. 51, 673-682] mating model in which a cohort of males and females of various 'fitness' or 'attractiveness' levels are randomly paired in successive periods and mate if they accept each other. Their model compared two acceptance rules chosen to represent homotypic (similarity) preferences and common (or 'type') preferences. Our earlier paper modeled the first kind by assuming that if a level x male mates with a level y female, both get utility -|x-y|, whereas this paper models the second kind by giving the male utility y and the female utility x. Our model can also be seen as a continuous generalization of the discrete fitness-level game of Johnstone [1997. Behav. Ecol. Sociobiol. 40, 51-59]. We establish the existence of equilibrium strategy pairs, give examples of multiple equilibria, and conditions guaranteeing uniqueness. In all equilibria individuals become less choosy over time, with high fitness individuals pairing off with each other first, leaving the rest to pair off later. This route to assortative mating was suggested by Parker [1983. Mate Choice, Cambridge University Press, Cambridge, pp. 141-164]. If the initial fitness distributions have atoms, then mixed strategy equilibria may also occur. If these distributions are unknown, there are equilibria in which only individuals in the same fitness band are mated, as in the steady-state model of MacNamara and Collins [1990. J. Appl. Prob. 28, 815-827] for the job search problem.

Animals↗

PubMed2006

A spatially explicit model for an Allee effect: why wolves recolonize so slowly in Greater Yellowstone.

A reduced probability of finding mates at low densities is a frequently hypothesized mechanism for a component Allee effect. At low densities dispersers are less likely to find mates and establish new breeding units. However, many mathematical models for an Allee effect do not make a distinction between breeding group establishment and subsequent population growth. Our objective is to derive a spatially explicit mathematical model, where dispersers have a reduced probability of finding mates at low densities, and parameterize the model for wolf recolonization in the Greater Yellowstone Ecosystem (GYE). In this model, only the probability of establishing new breeding units is influenced by the reduced probability of finding mates at low densities. We analytically and numerically solve the model to determine the effect of a decreased probability in finding mates at low densities on population spread rate and density. Our results suggest that a reduced probability of finding mates at low densities may slow recolonization rate.

Acclimatization↗

PubMed2005

Increases in the circulating testosterone of maturing male guinea pigs appear neither necessary nor sufficient for heightened maternally directed sexual and social/courtship behavior.

Periadolescent male guinea pigs housed continuously with their mother since birth exhibit little maternally directed sexual behavior. However, if rehoused apart from the mother for 24 h, they show elevations in circulating testosterone concentrations and display frequent sexual responses and increased social/courtship behavior upon reunion with her. We investigated the role of testosterone in the disinhibition of maternally directed sexual and social/courtship behavior. Subcutaneous implants of testosterone (Experiment 1) did not trigger maternally directed sexual behavior or an increase in social/courtship behavior among males housed continuously with their mothers. Further, neither blocking androgen receptors (Experiment 2) nor preventing the surge in testosterone (Experiment 3) prevented males housed without the mother from exhibiting increased maternally directed sexual and social/courtship behavior upon reunion. These findings indicate that the increase in testosterone that males exhibit when rehoused apart from the mother is neither sufficient nor necessary for the disinhibition of maternally directed sexual and social/courtship behavior observed when mother and son are reunited.

Androgens↗

PubMed2006

Conditional expression of women's desires and men's mate guarding across the ovulatory cycle.

Thirty-eight normally cycling women provided daily reports of sexual interests and feelings for 35 days. Near ovulation, both pair-bonded and single women reported feeling more physically attractive and having greater interest in attending social gatherings where they might meet men. Pair-bonded women who were near ovulation reported greater extra-pair flirtation and greater mate guarding by their primary partner. As predicted, however, these effects were exhibited primarily by women who perceived their partners to be low on hypothesized good genes indicators (low in sexual attractiveness relative to investment attractiveness). Ovulation-contingent increases in partner mate guarding were also moderated by female physical attractiveness; midcycle increases in mate guarding were experienced primarily by less attractive women, whereas more attractive women experienced relatively high levels of mate guarding throughout their cycle. These findings demonstrate ovulation-contingent shifts in desires and behaviors that are sensitive to varying fitness payoffs, and they provide support for the good genes hypothesis of human female extra-pair mating. The daily assessment method provides an important supplement to existing studies using scheduled laboratory visits as the purpose of the study (examining cycle-related variation) is not known by participants.

Adolescent↗

PubMed2006

Ovulatory shifts in human female ornamentation: near ovulation, women dress to impress.

Humans differ from many other primates in the apparent absence of obvious advertisements of fertility within the ovulatory cycle. However, recent studies demonstrate increases in women's sexual motivation near ovulation, raising the question of whether human ovulation could be marked by observable changes in overt behavior. Using a sample of 30 partnered women photographed at high and low fertility cycle phases, we show that readily-observable behaviors - self-grooming and ornamentation through attractive choice of dress - increase during the fertile phase of the ovulatory cycle. At above-chance levels, 42 judges selected photographs of women in their fertile (59.5%) rather than luteal phase (40.5%) as "trying to look more attractive." Moreover, the closer women were to ovulation when photographed in the fertile window, the more frequently their fertile photograph was chosen. Although an emerging literature indicates a variety of changes in women across the cycle, the ornamentation effect is striking in both its magnitude and its status as an overt behavioral difference that can be easily observed by others. It may help explain the previously documented finding that men's mate retention efforts increase as their partners approach ovulation.

Adolescent↗

PubMed2006

Testosterone levels and gular pouch coloration in courting magnificent frigatebird (Fregata magnificens): variation with age-class, visited status and blood parasite infection.

Male magnificent frigatebirds (Fregata magnificens) possess a seasonally expressed skin ornament, namely the red and inflatable gular pouch, and are, therefore, a convenient model for the study of some theories related to the evolution of possible testosterone-dependent sexual skin coloration. Here we report the findings of a study performed over four consecutive mating seasons in the Mexican national park Isla Isabel. We investigated differences in testosterone level and gular pouch coloration in courting males in relation to the categories: age-class, visited status and blood parasite infection. Gular pouch color saturation increased with age-class. Investigated frigatebirds were infected only with Haemoproteus iwa (Haemosporida, Haemoproteidae), with an overall prevalence infection of 15.5%. Prevalence of the infection increased with birds' age-class. Testosterone levels were significantly higher in infected males, who also had lighter colored gular pouches. In non-infected males, those visited by a female had higher testosterone levels than non-visited males. Gular pouch lightness and redness were negatively correlated but only redness in non-visited non-infected males was positively correlated with testosterone levels. Gular pouch saturation in visited and infected males was positively correlated with body mass, which also increased with age-class. Mated males had lower testosterone levels and lighter, less red and saturated gular pouch coloration than courting males. In summary, we found that coloration of the male skin ornament could reflect age-class (saturation), parasite infection (lightness) and mated status (all), together with indications of condition and testosterone dependency of ornament expression.

Aging↗

PubMed2004

Longitudinal predictors of serious physical and sexual dating violence victimization during adolescence.

BACKGROUND: This study identifies potentially modifiable risk factors for the onset of and chronic victimization from serious physical and sexual dating violence. METHODS: One thousand two hundred ninety-one 8th and 9th graders from a county in North Carolina were assessed annually for 5 and 4 years, respectively. RESULTS: For males, having been hit by an adult with the intention of harm, having low self-esteem, and having been in a physical fight with a peer predicted onset of serious physical dating violence victimization. Those variables, plus having a friend who has been a victim of dating violence, alcohol use, and being white, predicted chronic victimization for males. For females, onset of serious physical dating violence victimization was predicted by having been hit by an adult; that variable, plus living in a single-parent household, predicted chronic victimization from serious physical violence. Also for females, onset of sexual violence victimization was predicted by having a friend who has been the victim of dating violence and being depressed; those variables and gender stereotyping predicted chronic victimization from sexual dating violence. CONCLUSIONS: The findings identify high-risk groups and risk factors to target for intervention and have implications for approaches to delivering dating violence prevention programs.

Adolescent↗

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