Sex allocation theory predicts that mothers should adjust their sex-specific reproductive investment in relation to the predicted fitness returns from sons versus daughters. Sex allocation theory has proved to be successful in some invertebrate taxa but data on vertebrates often fail to show the predicted shift in sex ratio or sex-specific resource investment. This is likely to be partly explai...

► We examine the influence of appearance-based cues on judgments of party affiliation. ► We find that facial cues associated with political party affiliation are sex-typed. ► Female Republicans are significantly more sex-typical than female Democrats. ► Accuracy of party judgments varies by sex-typicality and politician party. ► Facial sex-typicality mediates the influence of politician sex and...

Background: Newborns’ health is one of the important indexes in health services. The aim of this study was to assess the relationship between newborns' sex and rate of admission at NICU and mode of delivery. Materials and Methods: This descriptive and analytic study was confirmed on 492 newborn that was admitted to NICU of Rouhani Hospital of Babol University from March 2012 to 2013. Data ...

CONTEXT Little is known about the sexual and reproductive health care needs of female sex workers in Dhaka, Bangladesh. METHODS Survey data were collected from 354 hotel-based and 323 street-based female sex workers using a venue-based stratified cluster sampling approach. In addition, in-depth interviews were conducted with 20 female sex workers recruited from drop-in centers. We calculated ...

BACKGROUND High sex ratios at birth (SRB) are seen in China, Taiwan, South Korea, parts of India and Vietnam. The imbalance is the result of son preference, accentuated by declining fertility. Prenatal sex determination and female feticides are common in many countries. It is reflected in sex ratio OBJECTIVE To determine reasons for the preferences for different sex; to find out whether there...

Abstract—Indonesian localization of Female Sex Workers (FSW) was one the largest in Southeast Asia, which has been taken by government since 2014. The impact mental health disorders not yet reported. This study aimed to compare anxiety disorder among ex-FSW and non-FSW. a prevalence compared non-FSW, located ex-localization Surabaya, Indonesia. Seventy-five participants met inclusion criteria w...

This study aimed to assess the level of condomless sex advertised online by private sex workers (PSW) in Sydney. In 2015, 750 online profiles of PSW, including 339 female, 53 male and 39 transgender PSWs, were reviewed. It was found that PSWs advertise protected anal and vaginal sex. However, 50% of female PSW advertised condomless oral sex. Age less than 25 years was associated with advertised...

Haplodiploid species display extraordinary sex ratios. However, a differential investment in male and female offspring might also be achieved by a differential provisioning of eggs, as observed in birds and lizards. We investigated this hypothesis in the haplodiploid spider mite Tetranychus urticae, which displays highly female-biased sex ratios. We show that egg size significantly determines n...

During meiotic prophase in male mammals, the heterologous X and Y chromosomes remain largely unsynapsed, and meiotic sex chromosome inactivation (MSCI) leads to formation of the transcriptionally silenced XY body. In birds, the heterogametic sex is female, carrying Z and W chromosomes (ZW), whereas males have the homogametic ZZ constitution. During chicken oogenesis, the heterologous ZW pair re...

This study examined levels of "burnout" and associated factors among a sample of female indoor sex workers in the Netherlands (N=96). Levels of burnout on 3 dimensions (emotional exhaustion, depersonalization, and personal competence) were assessed. Only sex workers' mean score on depersonalization was significantly higher than that of a comparison group of female nurses and comparable to those...