Archives of Sexual Behavior最新文献

Seasonal variation in birth rates is a ubiquitous property of human populations. Although the general birth rate is dependent on relatively few parameters—sexual behavior, zygote survival, and the number of ova released—the quantitative influence of the effects of each is difficult to estimate. Research has been directed more towards seasonal variation in physiology and less towards behavioral effects such as preferences for birthing in particular seasons. This may be because alongside seasonal variation in birth rate there is also seasonal variation in the multiple birth rate, which necessarily depends on the same physiological factors as the birth rate, suggestive of a link. Here we use a simulation that follows females through their reproductive lives, replicating the incidence of singleton and twin births that arise from single and double ovulations. We use the simulation to quantify the impact of seasonal variation in the physiological variables that affect birth rate. We can generate the seasonal variation in twinning rates observed in European populations, but this does not generate the magnitude of the observed seasonal variation in birth rate. Our simulation shows that, despite correlations between twinning rate and general birth rate, seasonal changes in sexual behavior are necessary to explain the magnitude of the seasonal variation in the general birth rate in humans.

Labial hypertrophy, which lacks an accepted definition, is generally understood to refer to morphological and aesthetic characteristics of the labia believed to deviate from a perceived norm. Such ostensive deviation has the potential to affect many domains of a person’s well-being, as does its surgical treatment, labiaplasty. Nearly 24,000 labiaplasty procedures were performed in the United States in 2022, representing a greater than three-fold increase since numbers were first reported in 2013. Nearly 20% of these procedures were performed on minors, and cases have been reported in children well before complete pubertal development or the age of personal consent. In this article, we explore the indications that are used to designate labiaplasty as “medically necessary” in minors, a status that, we argue, is required for such procedures to avoid fitting the definition of “medicalized FGM” (i.e., “female genital mutilation”) according to the World Health Organization. As a part of this, we consider the particular ways in which outcomes are measured in this population. We shed light on persistent methodological shortcomings in the research on labiaplasty, discuss ethical and legal implications, and make recommendations to improve the relevance, reliability, and generalizability of future investigations into this increasingly common, controversial surgical procedure.

This study examined the role of odors in sexual attraction and partner selection among non-heterosexual individuals. We searched using MESH terms in databases including PubMed, Embase, Scopus, Web of Science, Cochrane Central Register of Controlled Trials, CINAHL, and Clinical Trials. We focused on experimental or quasi-experimental studies where olfactory cues were used in partner selection. The studies had to identify participants’ sexual orientation and include heterosexuals for comparison. Seven studies, published between 2005 and 2014, involving 345 participants (Mean age, 27.09 years), met the criteria. Results suggest that sexual orientation affects both preference for and production of human body odors and that human body odors appear to provide cues about the sex and sexual orientation of potential partners. Most participants were male, limiting conclusions about the role of pheromones in attraction among non-heterosexual women.

While there is substantial research on what people want in their romantic and sexual partners, much of this work focuses on WEIRD, youthful samples, fails to consider the role of undesirable characteristics (i.e., things people do not want in partners) at all, or in conjunction with desirable characteristics (i.e., things people do want in partners), and may be overly reliant on psychometric approaches to pivotal variables in mating psychology like mate value and sociosexuality. In a nationally representative (online) sample of 2280 people from Czechia (aged between 18 and 50 years old), we examined linear and quadratic age, education, and self-perceived mate value (desirability) effects on the desired levels in mate choice of eight undesirable and seven desirable characteristics in men and women in relation to ostensible metrics of mate value. Self-perceived mate value alone explained little variance (men 1%, women 2%), while all mate value and mating strategy indicators together explained little variance of mate preferences and aversions (men 3%, women 5%). Desirable characteristics were better explained by mate value than undesirable ones. Our results are in line with evolutionary predictions suggesting that women are more demanding. Also, more qualities to offer correlate with more expectations in a partner.

The advent of the Internet has made pornography more accessible to many people, including teenagers. This systematic review aimed to synthesize data on factors associated with the consumption of sexually explicit internet materials (SEIM) among adolescents. A total of 753 records in Scopus, Embase, MEDLINE/PubMed, and PsycINFO databases were sorted. Forty-eight quantitative survey studies that presented original empirical results and addressed SEIM use among adolescents were included for data extraction, quality analysis, and synthesis. The prevalence of SEIM use varied substantially between studies due to inconsistencies between the operationalization methods used to assess the theoretical construct of SEIM, the period of use (days, months, years), and the age of the participants. SEIM use was highly related to being a boy and having an independent relational style. It was moderately associated with more sexual agency and hyperfemininity for girls and associated with small-to-moderate effect size, with more willingness to engage in casual sex. Sexual performance orientation, sexual permissiveness, bullying behavior, and Internet addiction might be associated with SEIM consumption, although the effect size of these associations was not calculated. Among developmental predictors with high and medium effect sizes, greater use of SEIM in adolescents was associated with being older or reaching puberty. Peer pressure or striving for peer popularity can account for boys’ greater exposure to SEIM. The results described show the importance of standardizing the evaluation of SEIM use. Literacy in the use of pornography among teenagers is essential to prevent the possible negative impacts of SEIM consumption.

Pornography use is common among adolescents. However, there has been limited in-depth examination of cross-country differences in adolescent pornography use. Therefore, the main aim of the present study was to understand cross-jurisdictional differences in problematic pornography use (PPU) in 1810 adolescents from Spain and Mexico. The relationship between sociodemographic variables, loneliness, sexual risk behaviors, and religiosity with PPU and cross-jurisdictional differences between the two Spanish-speaking populations was assessed. In the Spanish sample, pornography use was a mediator of risky sexual behaviors, with this association being greater in males, older individuals, and those with a non-heterosexual orientation. In the Mexican sample, non-use of condoms was directly statistically predicted by older age, poor familial relationships, low religiosity, and more frequent pornography use. Jurisdictional differences in relationships between variables were observed in the two samples (Spanish and Mexican). Clinical implications and potential sociocultural factors that may underlie observed differences in the two Spanish-speaking cultures are considered and warrant additional investigation.

Engaging in both sexual and affectionate behaviors with a romantic partner is often beneficial for adults’ sexual and relationship satisfaction and promotes relationship stability. However, prior research has primarily examined either adults’ sexual or affectionate behaviors, and has yet to explore patterns of sexual and affectionate behaviors and their associations with sexual and relationship satisfaction. In the current paper, we used a person-centered approach and latent profile analysis to identify specific profiles of adults’ physical behaviors in same-gender and mixed-gender relationships, and examined associations of these profiles with sexual and relationship satisfaction. Adults (N = 336, 85.4% LGBTQ+; 45% women, 30% men, 38.6% gender-diverse; M_age = 29.07 years) who were currently in a committed romantic partner relationship for at least six months completed online surveys. We found that a 3-profile solution best fit the data and identified the following profiles: Infrequent Physical Behaviors, Affection-focused Behaviors, and Comprehensive Physical Behaviors. Adults in the Infrequent Physical Behaviors profile were less sexually and relationally satisfied than adults in the other profiles. Adults in the Comprehensive Physical Behaviors profile were more sexually satisfied than the two other profiles. Further, profiles did not differ for mixed-gender compared to same-gender or gender-diverse couples. Our findings have implications for understanding the diversity in adults’ physical behavior patterns, including how clinicians might better support adults’ sexual and relationship satisfaction.

A dominant view among researchers is that boys’ sexual interactions with adult men are traumatizing. In contrast, many gay men recall childhood sexual experiences with adult males as positive. The current study tested for both of these outcomes by examining recalled boyhood sexual experiences of older gay men. Interviews were conducted in the 1970–1980s, and thus, before the public view became popular that child–adult sexual interactions must be traumatizing. Quantitative analyses suggested that gay men with boyhood sexual experiences with adult males (n = 7, mostly aged 11–16 at first experience with men aged 20s to 50s) were as well adjusted as those without these experiences (n = 10), and these experiences were usually viewed positively (71%). Narrative analyses indicated that adjustment problems in adulthood were not related to these early sexual experiences but to other factors such as parental abusiveness, societal intolerance, internalized homophobia, or social isolation.