Empirical tests of sexual selection theory: Predictions of sex differences in onset, intensity, and time course of sexual arousal

An evolutionary model of sexual behavior was used to generate predictions about sex differences in sexual arousal. Survey instruments were used to test these predictions with 388 adolescents, aged 12-18, from varying socioeconomic strata and geographic regions. Boys reported that their first arousal occurred at the start of puberty or before, usually in response to a visual stimulus, whereas girls generally reported first arousal as occurring 2-3 or more years after puberty, within a social/romantic context. The modal boy reported sexual arousal as occurring several times daily, the modal girl once or twice a week. Boys reported their arousal to be more discriminable, of greater intensity, and more distracting than the girls'. The sexes differed in attitudes related to sexual behavior. However, when reporting emotions and feelings coterminous with sexual arousal, the sexes did not differ. Retrospective college samples of 262 students from West Coast colleges replicated the adolescent data. A survey of 280 East Coast college students found that women's sexual arousal was significantly more partner-dependent than men's. Results were interpreted as supporting evolutionary models of sex differences in sexuality.     

Predicting Korean Adolescents' Sexual Behavior

Abstract

Using data from 370 adolescent males and 390 adolescent females, this study investigates factors associated with Korean adolescents' sexual behavior. The data showed that sixteen percent of the sample reported some type of intimate sexual behavior. The results from regression analyses indicate that alcohol use, dating mood, love for partner, similarity of sexual attitude between partners, and interaction between respondents' attitude on sex and alcohol use were significant predictors of Korean adolescents' sexual behavior with adjusted R² of .61. The factors significant for adolescents' sexual behavior differed by gender. The factors significant for adolescent males and adolescent females accounted for 65% and 61% of the explained variance for adolescent males' and adolescent females' sexual behavior, respectively. In both cases, dating mood was a strong predictor of adolescents' sexual behavior. Contrary to expectations specified, neither parental factors nor sibling influence was significant.     

Parent–Adolescent Sexual Communication and Its Association With Adolescent Sexual Behaviors: A Nationally Representative Analysis in the Netherlands

Sexual communication is a principal means of transmitting sexual values, beliefs, expectations, and knowledge from parents to children. Although this area has received considerable research attention, more studies with representative samples are needed to assure that findings are reflective of populations of interest. A nationally representative sample of parent–adolescent dyads (N = 2,965; mean adolescent age = 13.8 years) in the Netherlands was employed to examine the frequency of parent–adolescent sexual communication and its association with adolescent sexual behaviors (defined as sexual initiation, condom use, and contraceptive pill use). Nine communication topics in the areas of anatomy, relationships and rights, and protection and contraception were examined. In all, 75%of parents reported having discussed at least one topic multiple times with their adolescents. Romantic relationships were discussed most frequently. Hierarchical logistic regression analyses indicated that parent–adolescent sexual communication on protection and contraception was positively associated with adolescent sexual initiation and contraceptive pill use but not condom use. This may reflect that adolescents, when they become sexually active, are more likely to discuss sexuality with their parents. Findings are interpreted within the context of Dutch culture, which is generally accepting of adolescent sexuality and characterized by open sexual communication.     

Pathways to Intergenerational Adolescent Childbearing in a High‐Risk Sample

Previous research indicates that children of adolescent mothers are more likely to experience an adolescent birth than are children of older mothers. Using a longitudinal sample of 293 high‐risk mothers and their 19‐year‐old children, we investigated mediators of the intergenerational pattern of adolescent childbearing. Results from multigroup path models indicate that the intergenerational effect is (a) significant for children of unmarried mothers above and beyond mother’s prebirth socioeconomic status and education level, (b) fully mediated through early sexual intercourse related to presence of a father figure and early home environment for girls, and (c) partially mediated by early physical development for boys. Relation of findings to current models of early sexual behavior and childbearing is discussed.     

Strategies and cues adolescents use to assess the age of an online stranger

A common risk among adolescents is sexual solicitation, in which an adolescent is asked to provide sexual information, engage in sexual talk, or in sexual activities. Although scholars increasingly address this topic from an intrapersonal perspective, there is little attention to factors of language use and message content. In two focus group studies, we investigated whether adolescent girls consider themselves capable of assessing whether an online stranger is an adult or a peer, the extent to which adolescent girls actually succeed in making this assessment, the strategies they apply to do so, and the content- and language-related cues focused on. Our findings suggest that most of the adolescent girls are confident in their ability to assess whether the stranger is a peer or an adult with possible sexual intentions. However, we also found that only 43% were able to correctly make this assessment. Most of the adolescents seem to apply the passive strategy of uncertainty reduction: They scan the profile page of the stranger, check contact information, and the profile picture. They may choose to apply the interactive strategy to find out more about the online stranger. Important content-related cues that alarm adolescent girls are: ignoring personal questions, showing an exaggerated amount of interest, acting as a friend, and being sexually oriented. Language cues mentioned related to word usage, abbreviations, sentence length, and tone.     

Monitoring and evaluation of loveLife's AIDS prevention and advocacy activities in South Africa, 1999–2001

loveLife is the largest effort ever launched in South Africa to change adolescent sexual behaviour with the aim of reducing the rate of HIV infection among 15–20 year olds by 50%, reducing other STIs, and reducing the incidence of teenage pregnancy. loveLife combines high-powered media awareness and education, development of adolescent-friendly reproductive health services, and outreach and support programmes. The 5-year research and evaluation plan includes a multi-year comprehensive observational study, tracking change in a range of behavioural indicators and in sexual health outcomes. In its first 2 years, loveLife reached more than 4 million youth. Sixty-two percent of youth and 59% of their parents/guardians recognize the brand, while the vast majority of parents (97%) and youth (89%) exposed to loveLife, identified loveLife as being positive. Challenges in the next years are the continued roll out of the programme, and the development of institutional support and behaviour change.     

Visual Attention to Dynamic Spatial Relations in Infants and Adults

Previous research has found that kinematic features of interactions, such as spatial proximity, capture adult visual attention. The current research uses online measures of gaze behavior to determine attentional capture to objects with reduced interobject spacing in adults as well as infants at 5 and 12 months. The three age groups observed three identical geometrical shapes that moved randomly. Relative distance between the objects was mapped and intervals of high and low spatial proximity were identified. Findings demonstrate that only adults and 12‐month‐olds look significantly more at the objects that are close during instances of high spatial proximity, while 5‐month‐olds look at chance. The findings speak for a developmental trend in oculomotor processes, where a bias to look at objects with high spatial proximity develops within the first year of life.     

Parenting Practices and Adolescent Sexual Behavior: A Longitudinal Study

The effects of parental attitudes, practices, and television mediation on adolescent sexual behaviors were investigated in a study of adolescent sexuality and media (N = 887). Confirmatory factor analyses supported an eight‐factor parenting model with television mediation factors as constructs distinct from general parenting practices. Logistic regressions indicated that adolescents reporting greater parental disapproval and limits on viewing at Wave 1 were less likely to initiate oral sex between Waves 1 and 2. Adolescents who reported more sexual communication with parents were more likely to initiate oral sex. Results for vaginal intercourse were similar to those for oral sex. Coviewing was a significant negative predictor of initiation of sexual behavior. Parental attitudes and television mediation can delay potentially risky adolescent sexual behaviors.     

What They Don't Know Won't Hurt Them: Parents’ Judgments About Lying to Their Adolescents

This research examined judgments about parents lying to their adolescents. Ninety‐six participants from four primarily Caucasian groups (24 parents of 18‐year‐olds, 24 parents of 14‐year‐olds, 24 18‐year‐olds, and 24 14‐year‐olds) assessed hypothetical situations in which a parent lies to their adolescent about their past experience engaging in risky activities such as drug use and shoplifting. Evaluations and justifications for deception varied as a function of the domain of each act, the age of the adolescent being lied to, and consideration of parents’ duty to foster a protective and trusting relationship. Results are discussed in terms of parents’ and adolescents’ reasoning about deception to achieve and resist socialization goals in several (moral, personal, prudential, and multifaceted) social‐cognitive domains.     

Adolescent males' willingness to report masturbation

This paper compares contemporaneous and retrospective reports of adolescent masturbation experience, partnered sexual behavior, and nonsexual problem behavior. Analyses are based on data from 59 White males who were followed for 3 years in early adolescence and later reinterviewed as young adults. Comparisons of adolescent and adult reports about adolescent behavior indicated that adolescent masturbation, but not coitus and wet dreams, was more likely to be reported in young adulthood than in adolescence, even when confidential reporting techniques were used. In contrast, nonsexual problem behavior occurring during adolescence was more likely to be reported in adolescence than in early adulthood. These findings are consistent with other literature indicating that masturbation is a distinctly sensitive behavior that adolescent respondents may be particularly reluctant to report. These results suggest that adult retrospective reports may more accurately represent adolescent masturbation activity, but may underrepresent adolescent nonsexual problem behavior.     

Affairs of the Heart: Qualities of Adolescent Romantic Relationships and Sexual Behavior

We know more about parent and peer influences than about the ways in which specific qualities of adolescent romantic relationships may influence sexual decision‐making. Using data from the Toledo Adolescent Relationships Study, we focus on communication processes and emotional feelings, as well as more basic contours of adolescent romantic relationships, including power and influence dynamics. Controlling for traditional predictors and duration of the relationship, results suggest that subjectively experienced relationship qualities matter for understanding teens' sexual behavior choices. Further, findings indicate a similar effect of most relationship qualities on male and female reports of sexual behavior. However, influence and power dynamics within the relationship were not related to the likelihood that boys reported sexual intercourse in a focal relationship. In contrast, girls who perceived a more favorable power balance were less likely to report sexual intercourse than their female counterparts who perceived a less favorable power balance. Recognizing that the results capture reciprocal influence processes, longitudinal and qualitative data are used to further explore the complex nature of these associations.     

Gender,Generational Status,and Parent–Adolescent Sexual Communication: Implications for Latino/a Adolescent Sexual Behavior

There is little research on how specific parent–adolescent sexual communication topics influence Latino/a youth's sexual behaviors, and how gender and generational status may moderate effects. This study examined effects of three different messages on intercourse and condom use among 1,944 Latino/as from the National Longitudinal Study of Adolescent Health (T1 mean age = 15.46; SD = 1.50). Results indicated discussing health consequences predicted higher odds of intercourse 1 year later across gender and generation groups. Birth control recommendation effects on subsequent intercourse and condom use differed by generational status and gender. Results indicated that message content is important for understanding effects of parent–adolescent sex communication on adolescents' behavior and underscored the need to consider gender and generational status in Latino/a parent–adolescent sexual communication studies.     

School contextual factors and race differences in adolescent sexual behaviors

Abstract

Although there exist a voluminous number of studies examining predictors of adolescent sexual behavior, few studies have explored the role of the school social context in influencing teen sexual activity generally and specifically, the role that school contextual factors play in helping understand race differences in risky sexual behaviors. Using data from a nationally representative school-based survey of American youth in Grades 7–12, we find support for our core hypothesis that school contextual factors are associated with risky sexual behavior, number of sexual partners, and ever having sex, albeit it nuanced ways and that such factors cannot account for much of the race gap in adolescent sexual behavior. We interpret these findings to be more supportive of a social contagion model (versus a school climate model).     

Hormones and history: the evolution and development of primate female sexuality

Sexual behavior is required for reproduction in internally fertilizing species but poses significant social and physical risks. Females in many nonprimate species have evolved physical and behavioral mechanisms restricting sexual behavior to when females are fertile. The same hormones producing female fertility also control these mechanisms, assuring that sex only occurs when reproduction is possible. In contrast to nonprimate mammals, hormones do not regulate the capacity to engage in sex in female anthropoid primates, uncoupling fertility and the physical capacity to mate. Instead, in primates, sexual motivation has become the primary coordinator between sexual behavior and fertility. This dependence upon psychological mechanisms to coordinate physiology with behavior is possibly unique to primates, including humans, and allows a variety of nonphysiological influences, particularly social context, to regulate sexual behavior. The independence between hormonal state and sexual behavior allows sex to be used for social purposes. This complex regulation of primate sexuality develops during adolescence, where female monkeys show both hormonally influenced sexual motivation and socially modulated sexual behavior. We present findings from rhesus monkeys illustrating how social context and hormonal state interact to modulate adolescent and adult sexuality. It is argued that this flexibility in sexual behavior, combined with a tight regulation of sexual motivational systems by reproductive hormones, allows sexual behavior to be used for nonreproductive purposes while still assuring its occurrence during periods of female fertility. The evolutionary pressures that produced such flexibility in sexual behavior remain puzzling, but may reflect the importance of sexuality to primate social attraction and cohesion.     

Light and Heavy Heterosexual Activities of Young Canadian Adolescents: Normative Patterns and Differential Predictors

The objectives of this research were to explore patterns of heterosexual activity in early adolescence and to examine the differential pathways to light and heavy heterosexuality. We utilized the National Longitudinal Survey of Canadian Children and Youth (NLSCY) in which heterosexual behaviors, as well as puberty, parenting processes, peer self‐concept, and problem behaviors were examined. The heterosexual activities of the majority of 12‐ and 13‐year‐old adolescents were largely confined to light activities of hugging, holding hands, and kissing. Heavy activities such as petting and sexual intercourse were reported less often. Using predictor variables from Cycle 1 of the NLSCY when participants were 10‐ and 11‐year‐olds, SEM analyses indicated that puberty and higher peer self‐concept shared significant direct pathways to both light and heavy heterosexuality. Heavy sexual activity, however, was uniquely associated with the risk factors of adolescent problem behaviors. Positive and hostile parenting styles were indirectly associated with light sexual activity through peer self‐concept. Positive and hostile parenting styles were also indirectly associated with heavy sexual activity through both peer‐oriented self‐concept and problem behaviors. Results support differential patterns and predictors of light and heavy sexuality in early adolescence.     

The Evolution of Male-Male Sexual Behavior in Humans

Abstract

This paper examines male-male sexual behavior from an evolutionary perspective. I begin with a discussion of the major difficulties associated with the scientific study of homosexuality and a clarification of some concepts in human sexuality and evolutionary psychology. Following is a presentation of several established evolutionary theories of homosexuality and a critique of their major assumptions. Based on common patterns of male-male sexual behavior in humans identified by anthropologists, I argue that the evolutionary origin of male-male sexual behavior is based on the same dominance-submission mechanisms that gave rise to male-female sexual behavior. Further, I argue that male-male sexual behavior evolved more fully in human males than in other primate males because male-male alliances played a greater role in human male reproductive success. Specifically, male-male sexual behavior is speculated to be an exaptation of the sociosexual behavior used by primates to establish, regulate, and maintain relationships. It is posited that same-sex sexual behavior in human males reinforced alliances that contributed directly to male survival and indirectly to male reproduction. This alliance theory of the evolution of male-male sexual behavior is compatible with broader current theory on human evolution. The same neurological mechanism theorized to be involved in male-female sexual attraction and behavior is purported to mediate male-male sexual attraction and behavior. Finally, I argue that exclusive same-sex attraction in human males is due to an interaction between genetic, cultural, developmental and psychological factors. doi:10.1300/J056v18n04_02     

The Evolutionary Psychology of Human Mate Choice

Abstract

The recent incorporation of sexual selection theories into the rubric of evolutionary psychology has produced an important framework from which to examine human mating behavior. Here we review the extant empirical and theoretical work regarding heterosexual human mating preferences and reproductive strategies. Initially, we review contemporary evolutionary psychology's adaptationism, including the incorporation of modern theories of sexual selection, adaptive genetic variation, and mate choice. Next, we examine women's and men's mating preferences, focusing on the adaptive significance of material, genetic and fertility benefits, and their relationship to environmental characteristics. Following this, we consider human mate choice in relation to non-adaptive preferences. This discussion ends with a look at context effects for individual differences in mate-preferences and reproductive strategies.     

Preadolescent Parenting Strategies and Teens' Dating and Sexual Initiation: A Longitudinal Analysis

In this article we examine the effects of preadolescent parenting strategies on timing of adolescents' dating and sexual initiation. Using data from the 2 waves of the National Survey of Families and Households (1987–1988 and 1992–1994) involving interviews with parents as well as adolescents 4 years later, we estimate the effects of preadolescent parental support, coercive control, and monitoring on the timing of teens' dating and sexual initiation. We also examine how adolescents' gender, race, family structure, and socioeconomic background affect relationships between earlier parenting strategies and adolescent dating and sexual debut. We find evidence for the effect of preadolescent parental monitoring, though relatively little connection between parental support and coercive control, and variations in the timing of adolescent dating and sexual initiation. The findings suggest that parental monitoring prior to the onset of adolescence is important as a basic foundation for young people who later must make behavioral choices outside of parental purview.     

An examination of sexual strategies used by urban southern and rural Midwestern university women

The purposes of this study were (a) to determine whether women's use of persuasion, non‐physical coercion, and physical force strategies to obtain sex from a man varied between U.S. women from an urban Southern and rural Midwestern university and (b) to determine if sexual behavior history and early courtship behavior affected the use of these strategies (or not using any strategy). Women from the Midwest and the South did not differ in their use of sexual strategies. There were, however, other variables that accounted for differences in women's use of sexual strategies. Women who used persuasion strategies had fewer lifetime sexual partners than women who used any other strategy. Women who used physical force strategies reported a lower age at first intercourse and more early courtship behaviors than all others. Overall, the results indicated that sexual strategies are related to sexual behavior history and early courtship behaviors rather than cultural setting or demographics.     

Gender,Contraceptive Attitudes,and Condom Use in Adolescent Romantic Relationships: A Dyadic Approach

Although sexual risk behavior occurs in a dyadic context, most studies of adolescent sexual behavior focus on individuals. This study uses couple data (N = 488 couples) from the National Longitudinal Study of Adolescent Health to examine how partners' contraceptive attitudes correlate over time and whether male or female partners' attitudes are better predictors of condom use. Net of their own prior attitudes, partners' prior attitudes predicted both male and female adolescents' Wave 2 attitudes. This association was stronger for female than for male adolescents, suggesting that female attitudes were influenced more by males' prior attitudes than vice versa. When entered together, only male adolescents' attitudes predicted dyadic condom use. Findings suggest that male partners may have greater influence on adolescent contraceptive decisions and that prevention programs should emphasize the relational context of sexual behavior.