Beyond Age at First Sex: Patterns of Emerging Sexual Behavior in Adolescence and Young Adulthood

Purpose—Although the emergence of sexual expression during adolescence and early adulthood is nearly universal, little is known about patterns of initiation. Methods—We used latent class analysis to group 12,194 respondents from Waves I and IV of the National Longitudinal Study of Adolescent Health (Add Health) into one of five classes based on variety, timing, spacing, and sequencing of oral-genital, anal, and vaginal sex. Multinomial logistic regression models, stratified by biological sex, examined associations between sociodemographic characteristics and class membership. Results—Approximately half of respondents followed a pattern characterized predominately by initiation of vaginal sex first, average age of initiation of approximately 16 years, and spacing of one year or more between initiation of the first and second behaviors; almost one third initiated sexual activity slightly later but reported first experiences of oral-genital and vaginal sex within the same year. Classes characterized by postponement of sexual activity, initiation of only one type of behavior, or adolescent initiation of anal sex were substantially less common. Compared to White respondents, Black respondents were more likely to appear in classes characterized by initiation of vaginal sex first. Respondents from lower socioeconomic backgrounds were more likely to be in classes distinguished by early/atypical patterns of initiation. Conclusions—A small number of typical and atypical patterns capture the emergence of sexual behavior during adolescence, but these patterns reveal complex associations among different elements of emerging sexuality that should be considered in future research

12 Tips to Guarantee a Fragmented (Absolutely Terrible) Curriculum in a Time of Crisis

Medical education scholarship is filled with articles focused on rigorous curriculum design and innovation. In the midst of a public health crisis, the authors aim to provide a reflective guide to curriculum development focused on curriculum gone wrong. The authors propose twelve recommendations that will bring all educators closer to curricular failure

Older Romantic Partners and Depressive Symptoms During Adolescence

Although developmental theory predicts that adolescent romantic relationships have important benefits, empirical evidence suggests that they may also carry substantial psychosocial risk. This study uses data from 4,948 respondents (50% female) in Wave I and Wave II of the National Longitudinal Study of Adolescent Health to examine the association between involvement with an older romantic partner and depressive symptoms during adolescence. Ordinary least squares regression models compared Wave II depressive symptoms among respondents with older partners (defined as an age difference of 2 or more years) to respondents with same-age or younger partners, controlling for baseline depressive symptoms and sociodemographic characteristics. Ten percent of females and two percent of males reported having an older romantic partner at Wave II. Among females only, involvement with an older romantic partner was associated with a modest but significant increase in depressive symptoms between waves. This association was largely mediated by increases in substance use. Findings suggest that involvement with an older male partner during adolescence may increase the risk of poor emotional outcomes among females

Developing and exploring a theory for the lateral erosion of bedrock channels for use in landscape evolution models

Understanding how a bedrock river erodes its banks laterally is a frontier in geomorphology. Theories for the vertical incision of bedrock channels are widely implemented in the current generation of landscape evolution models. However, in general existing models do not seek to implement the lateral migration of bedrock channel walls. This is problematic, as modeling geomorphic processes such as terrace formation and hillslope–channel coupling depends on the accurate simulation of valley widening. We have developed and implemented a theory for the lateral migration of bedrock channel walls in a catchment-scale landscape evolution model. Two model formulations are presented, one representing the slow process of widening a bedrock canyon and the other representing undercutting, slumping, and rapid downstream sediment transport that occurs in softer bedrock. Model experiments were run with a range of values for bedrock erodibility and tendency towards transport- or detachment-limited behavior and varying magnitudes of sediment flux and water discharge in order to determine the role that each plays in the development of wide bedrock valleys. The results show that this simple, physics-based theory for the lateral erosion of bedrock channels produces bedrock valleys that are many times wider than the grid discretization scale. This theory for the lateral erosion of bedrock channel walls and the numerical implementation of the theory in a catchment-scale landscape evolution model is a significant first step towards understanding the factors that control the rates and spatial extent of wide bedrock valleys

Sexual Timetables for Oral-Genital, Vaginal, and Anal Intercourse: Sociodemographic Comparisons in a Nationally Representative Sample of Adolescents

Objectives. We documented the prevalence and relative timing of oral-genital, vaginal, and anal intercourse during adolescence and examined whether these timetables varied by sociodemographic factors

Reproductive health of young adults with physical disabilities in the U.S.

Previous research shows reduced cervical and breast cancer screening among women with physical disabilities. However, other indicators of reproductive health have been largely ignored. We aimed to compare the reproductive health of young adults in the U.S. with and without physical disabilities in a nationally-representative sample