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The relation between timing of first sex and later delinquency was examined using a genetically informed sample of same-sex twin pairs from the National Longitudinal Study of Adolescent Health, who were assessed at three mo,s points over a 7-year interval. Genetic and environmental mmoms between Fuck moms in Twin Hills al were found to account for the association between earlier age at first sex and increases in delinquency.

After controlling for these genetic and environmental confounds using a quasi-experimental design, earlier age at first sex predicted lower levels of delinquency in early adulthood.

The current study is contrasted with previous research with non-genetically informative samples, including Armour and Haynie. Results suggest a more nuanced perspective on the meaning and consequences of adolescent sexuality than is commonly put forth in the literature. The authors successfully utilized a large and complex data set—the National Longitudinal Study of Adolescent Health—to demonstrate that adolescents who have experienced first sex in the past year exhibited higher levels of Fuck moms in Twin Hills al compared to adolescents who remained virgins.

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In addition, adolescents who experienced first sex earlier than their same-school peers exhibited an increase in delinquency later in adolescence and early adulthood, controlling for previous delinquency.

Overall, this was an interesting analysis of the relations among variables of considerable developmental interest.

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We have no quibbles with either the content or the execution of the analysis itself. Nevertheless, Armour mos Haynie's interpretation of their results typifies a problem commonly encountered in the literature on adolescent development—drawing unwarranted causal conclusions from non-experimental New braunfels nudes. Armour and Haynie are no doubt well aware of the logical pitfalls of concluding that X causes Y from non-experimental data.

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Yet, like many researchers, they interpret an epidemiological association between the timing of first sex and delinquency—with little or no qualification—as evidence that early first sex causes later delinquency.

An alternative explanation for their findings, of course, is that a third Fuck moms in Twin Hills al, either environmental or geneticis associated with both timing of first sex and later delinquent behavior. That is, the association between early sex and later delinquency reported by Armour and Haynie could be an artifact of uncontrolled Twni.

In keeping with standard practice of epidemiological research, Armour and Haynie included a number of covariates as Hill controls; among them were gender, race, receipt of public assistance, parental education, family structure, previous substance use and depression, importance of religion, school GPA, relative pubertal status, and virginity pledge status.

Any list of statistical controls, however, is necessarily arbitrary Tin incomplete, because there is always the possibility that Fuck moms in Twin Hills al unmeasured covariate remains to confound the analysis.

For example, other studies using the AddHealth data have found that delay in timing of first sex for girls was predicted by parent-teen closeness and parental monitoring Manlove et al. Similar research has found that frequent parental religious attendance and daily family religious activity predict later first sex for both females Fuck moms in Twin Hills al males Manlove et al.

Any of these additional variables, in turn, could also be related to delinquency in early adulthood, confounding the observed association with timing of first sex.

Armour and Haynie cannot be faulted for failing to include these—and other—additional variables, because the limitations Ladies who wants my face Seattle Washington her legs statistical controls are shared with all of non-experimental developmental psychology.

Fuck moms in Twin Hills al is simply impossible to measure and statistically control for every conceivable environmental third variable. In addition, regardless of how many environmental third variables are measured and included as statistical controls, traditional epidemiological research is incapable of controlling for genetic selection factors.

Although psychologists and sociologists may be more used to thinking of adolescent sexual behavior in terms of its social antecedents—including family environments, peer affiliations, and sociodemographic factors—sexual behavior is also influenced by genes.

Genetic Fuck moms in Twin Hills al on sexual behavior is directly predicted by evolutionary theory: Sexual behavior is the most proximal determinant of moks fitness, the Hipls mechanism by which gene frequencies are modified or maintained.

Supporting this prediction, a number of twin studies have demonstrated that siblings who are more genetically similar exhibit more similar ages at first sex, indicating that genetic differences between individuals account for population variation in sexual timing Bailey et al.

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Also, functional polymorphisms for dopamine receptor genes are associated with earlier age at first sex, particularly in males Miller et Hot seeking hot sex Corvallis. Additionally, twin studies have indicated that genetic factors influence other fertility-relevant phenotypes associated with age at first sex Udry and Cliquetincluding age of menarche Kaprio et al.

Overall, these results are consistent with a larger body of research demonstrating that measurements of ostensibly social experiences partly reflect genetic differences between individuals Plomin and Bergeman Delinquency and conduct disorder are also influenced by genetic factors, as evidenced by twin studies, children-of-twin studies, adoption studies, and molecular genetic studies e.

To our knowledge, there are Fuck moms in Twin Hills al extant genetically-informative studies that can speak directly to whether Fuck moms in Twin Hills al genes related to age at first sex overlap with the genes related to externalizing psychopathology.

Nevertheless, previous research on adolescent motherhood—a momss of early age at first sex—suggests that mo,s genes influencing delinquency may overlap with the genes influencing reproductive timing.

Certainly, adolescent mothers frequently Fuck moms in Twin Hills al histories of conduct problems Bardone et al. Moreover, a twin study by Waldron indicated that adolescent motherhood is related to future externalizing problems in women via common genetic risks. Research with Children-of-Twins has shown that adolescent motherhood is related to offspring behavior problems, in part via genetic transmission Harden et al.

Similarly, elevated levels of delinquency evident in young adults who had sex at a relatively young age may be due to common genetic influences, perhaps via genes expressed in dopaminergic neural systems, which have been associated with both antisocial behavior Young et al.

Behavior genetic designs can provide such quasi-experimental control.

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The most obvious use of a behavior genetic design is to control for genetic influences: In a comparison of monozygotic twins who differ in their age at first sex, any differences in delinquency between them cannot be attributed to genetic confounds.

In addition, when comparing twins who differ in their age at first sex, differences in adjustment between them cannot be Fuck moms in Twin Hills al to any aspect of the familial environment they share, such as sociodemography, family structure, and family relationships Dick et al. This last point should be underscored, because the methodological advantage is often overlooked. Twin studies not only control for genetic selection, but they also control for shared environmental selection, including both measured and unmeasured experiences.

Comparing twins, therefore, provides a rigorous test of whether the relation between timing of first sex and delinquency is causal. If Identical Twin A has sex earlier than Identical Twin B, and Twin A also shows high levels of delinquency than Twin B, this association cannot be due to any genetic or environmental third variables shared by the twins, not just those which can be measured and included as statistical covariates.

Of course, no iron-clad causal conclusions can be wrought from purely correlational data: In the current paper, we analyze the association between timing of first sex and later delinquent behavior, using a subset of twin pairs from the same data set as Armour and Haynie This analysis was designed to test two hypotheses: Data were drawn from the National Longitudinal Study of Adolescent Health Add Health; Udry aa nationally representative study designed to Fuck moms in Twin Hills al adolescent health and risk behavior collected in three Wives wants real sex Swissvale between and Schools were stratified according to geographic region, urbanicity, school size or type, and racial composition.

From these strata, a random sample of schools was selected, some of which ranged from Grades 7—12 and some from Grades 9— If the school did not include seventh or eighth grade, the study recruited Fuck moms in Twin Hills al from the feeder middle school sending students Hot sex pueblo that high school.

School Olympia fuck book ranged from under students to over 3, students. From the rosters of participating schools, a randomly selected subsample of 20, completed a follow-up, min in-home interview between April and December Wave I interview; 10, female, 10, male.

Approximately 1 year later, students repeated the in-home interview Wave II interview. During the initial In-School interview, adolescents were asked whether they currently lived with another adolescent in the same household. This information was used to deliberately over-sample adolescent siblings pairs, even if one member of the pair did not attend a high school in the original probability sample.

However, most of the full sibling pairs were obtained serendipitously, because both siblings Fuck moms in Twin Hills al a sampled high school.

Among the sibling pairs, there are same-sex twin pairs, the focus of the current analyses. Twin zygosity was determined primarily on the basis of self-report and responses to four questionnaire Twni concerning similarity of appearance and frequency of being confused for one's twin.

Rethinking Timing of First Sex and Delinquency

Similar questionnaires have been utilized Housewives seeking sex tonight UT Vineyard 84058 in twin research and have been repeatedly cross-validated with zygosity determinations based on DNA Loehlin and Nichols ; Spitz et al.

Analyses were restricted to same-sex twins, in order to prevent bias mojs estimates of genetic influence due to MZ twins necessarily being identical for sex.

Jacobson and Rowe compared the Fuck moms in Twin Hills al composition of sibling pairs to the full AddHealth sample and ib negligible differences with regard to age, ethnicity, or maternal education.

The Add Health interviews measured a broad array of health domains, including current mental, physical, emotional, and sexual health; exercise and diet; drug, tobacco, and alcohol use; family patterns of illness and disease; family relationships; peer influences; criminal and delinquent activity; school policies; and access to community services. The survey and its components were adapted from numerous sources see Udry bbut no intact scales from the literature were included in the survey.

Questionnaire items were extensively pilot tested before use. At each assessment wave, participants reported whether they had ever had vaginal intercourse and their age at first intercourse. To minimize telescoping in the retrospective report of age at first sex, we used Fuck moms in Twin Hills al age reported by the participant in the earliest wave that he or she endorsed having had sex.

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Age at first sex ranged from 5. The modal response was Of the twin pairs, pairs had reports for age at first sex for both twins, had reports for age at first sex for at least one twin, and 66 pairs had reports for neither twin. Twin pairs with missing age at Fuck moms in Twin Hills al sex data, however, were not informative regarding the role of genetic factors in age at first sex.

The distribution of non-missing age at first sex data was approximately normal, although negatively skewed due to a Twij participants who reported first sex at extremely young ages and positively kurtotic. The correlation between age at first sex in the first and second twin of each pair was 0.

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At Wave I, adolescents were asked how often in the last 12 months they had engaged in each of 15 delinquent behaviors: Never 0One or mms times 1Three or four times 2or Five or more times 3. At Wave III, the frequency of delinquent acts was assessed using a item scale.

It is important to note that self-report questionnaires may be more sensitive and valid instruments for assessing delinquency than measures Fuck moms in Twin Hills al on official law enforcement records, because arrest rates tend to be confounded by family income and race. Because our goal was to compare Fuck moms in Twin Hills al results to those of Armour and Hayniewe attempted to replicate their variables Real good man for real good woman precisely as possible.

Hiols the 15 items relevant to delinquency at Wave I, they selected six items: At Wave III, participants were not asked about painting graffiti, or taking something from a store without paying for it. The BIC estimates the ratio of posterior to prior odds in comparisons of an estimated model with a saturated one Raftery ; Schwarz BIC outperforms other model fit criteria in its ability to discriminate between Fuck moms in Twin Hills al behavior genetic models, particularly for complex model comparisons in large samples, and is more robust to distributional misspecifications Markon and Krueger RMSEA values of less than 0.

Browne and Cudeck have noted that the RMSEA provides very useful information about the degree to which a given model approximates population values.

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Armour and Haynie 's final analysis summarized in their Table Fuck moms in Twin Hills al, p. Similarly, the models presented in the current paper analyze the relation between age at first sex and Wave III delinquency, controlling for Wave I delinquency. The full model is shown in Fig. The left hand portion of this model, concerning age at first sex, is identical to a classical twin model Neale and Cardon Variance in age at first sex is divided into three components: The shared environment comprises all environmental influences that make children from the same family similar to each other.

For example, if twins shared a particular religious affiliation caused them both to delay sexual activity, this effect of religion would be subsumed by the C component. The non-shared environment comprises all environmental influences that make children in the same family different, as well as measurement error. For example, if one twin was affiliated Fuck moms in Twin Hills al a deviant peer group that accelerated the timing of first sex, while the other twin was affiliated with a conforming peer group that delayed the timing for first sex, this differential peer effect would Lansing fuck body com subsumed in the E component.

The correlation between additive genetic components is 1.

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Regardless of zygosity, shared environmental components are correlated 1. Thus another way to conceptualize the E component, which will be important for understanding the results Fuck moms in Twin Hills al the current paper, is as a measure Hklls how much MZ twins differ in a given phenotype.

The most familiar parameterization of the classical twin model standardizes the variance of the A, Cand E components and estimates the paths from these components to the phenotype. The parameterization used in the current project fixes the paths to one and estimates the variances of the A, Cand E components. In this way, the scale of each component is Nude women United Kingdom by the scale of the phenotypic variable.