Same-sex sexual behaviour is ubiquitous in the animal kingdom, but its adaptive origins remain a prominent puzzle. Here, I suggest the possibility that same-sex sexual behaviour arises as a consequence of the competition between an evolutionary drive for a wide diversity in traits, which improves the adaptability of a population, and a drive for sexual dichotomization of traits, which promotes ...

Same-sex sexual behaviour is ubiquitous in the animal kingdom, but its adaptive origins remain a prominent puzzle. Here, I suggest the possibility that same-sex sexual behaviour arises as a consequence of the competition between an evolutionary drive for a wide diversity in traits, which improves the adaptability of a population, and a drive for sexual dichotomization of traits, which promotes ...

Older age is often associated with asexuality. That is, older individuals are not viewed as desiring of sex, nor as sexually desirable to others. Broader social and cultural norms that downplay women's sexual desire and agency further compound these phenomena. Whether this popular image accurately reflects older women's sexual desires, behaviour and capacity to experience pleasure is unclear. D...

This article explores the socio-environmental factors to students’ sexual risk-taking behaviour at the University of KwaZulu-Natal (UKZN), South Africa. The research was conducted with both male and fema le students selected from two UKZN Campuses. In total, 96 in-depth interviews and four focus group discussions were conducted with an equal representation between male and female students. One ...

OBJECTIVE To compare the vaginal microbiota of women engaged in high-risk sexual behaviour (sex work) with women who are not engaged in high-risk sexual behaviour. Diverse vaginal microbiota, low in Lactobacillus species, like those in bacterial vaginosis (BV), are associated with increased prevalence of sexually transmitted infections (STIs) and human immunodeficiency virus (HIV) acquisition. ...

INTRODUCTION The proportion of young people exposed to pornographic materials through the internet in Nigeria is increasing. However, the influence of the exposure on their sexual behaviour has not been fully explored. This study therefore explored the effects of internet exposure on the sexual behaviour of young persons in Ibadan North Local Government Area of southwest Nigeria. METHODS A su...

BACKGROUND Hepatitis C virus (HCV) infection is a significant global health issue because it is widespread and persistent and can cause serious liver diseases. OBJECTIVES The aim of this study is to estimate HCV prevalence in women from the general population in different geographical areas worldwide and to assess the potential role of sexual behaviour in the virus transmission. STUDY DESIG...

The purpose of this meta-analysis was to assess the association between risky sexual behaviour and level of education and economic status in male youth. Previous tests of the association of risky sexual behaviour with levels of education and economic status have yielded inconsistent results. Using data from 26 countries, from both within and outside Africa, we performed a meta-analysis with a s...

BACKGROUND Many theorists posit that childhood sexual abuse has a central role in the aetiology of self-injurious behaviour. Studies that report statistically significant associations between a history of such abuse and self-injury are cited to support this view. AIMS A meta-analysis was conducted to determine systematically the magnitude of the association between childhood sexual abuse and ...

BACKGROUND Behaviour and related health outcomes of migrants have been suggested to shift towards the practices of the indigenous population of the host country. To investigate this, we studied generational differences in sexual behaviour between first- and second-generation migrants (FGMs and SGMs) in The Netherlands. METHODS In 2003-05, persons aged 16-70 years with origins in Surinam, the ...