UNLABELLED The perspectives of adolescents were solicited on the issue of sexual and reproductive health messages they received through dancehall music as well as their perceptions of parents' views of such messages and adolescents' indulgence with this genre of music. METHODS This sequential mixed methods study was completed in 2008. The study's qualitative component was summarized as the no...

Adolescents and adults show preferences for male and female body shapes consistent with evolutionary theories of reproductive fitness and mate selection. However, when these preferences for females with narrow waists (i.e., 0.7 waist-to-hip ratio) and men with broad shoulders (i.e., mesomorphic body shape) emerge during the lifespan is largely unknown. To address this knowledge gap, eye-movemen...

Most animals experience marked changes in reproductive status across development that are regulated by changes in the hypothalamo-pituitary-gonadal (HPG) axis. The upstream mechanisms regulating this axis remain less well understood. The neuropeptide kisspeptin serves as a positive regulator of reproduction; the precise actions of kisspeptin on the HPG axis in animals of differing developmental...

This study evaluates stoichiometry patterns in the androdioecious Acer tegmentosum, a species characterized by a rare reproductive system where males and hermaphrodites coexist. Altogether 31 hermaphrodites and 29 male plants were harvested and samples of leaves, current-year shoots, branches and coarse roots were analyzed to explore gender differences in biomass, C, N and P concentrations of t...

Differences in the ways in which males and females maximize evolutionary fitness can lead to intra-locus sexual conflict in which genes delivering fitness benefits to one sex are costly when expressed in the other. Trade-offs between current reproductive effort and future reproduction and survival are fundamental to the evolutionary biology of ageing. This leads to the prediction that sex diffe...

As commonly observed among closely related species within a variety of taxa, Drosophila species differ considerably in whether they exhibit sexual dimorphism in coloration or morphology. Those Drosophila species in which male external sexual characters are minimal or absent tend, instead, to have exaggerated ejaculate traits such as sperm gigantism or seminal nutrient donations. Underlying expl...

CONTEXT Parents have an influence on the sexual and reproductive health of adolescents, but evidence from Sub- Saharan Africa is limited. A better understanding of the relationship between different dimensions of parenting and recent sexual activity and contraceptive use is needed in the region. METHODS Data were collected in 2004 in nationally representative surveys of 12-19-year-olds in Bur...

To optimally time reproduction, animals must coordinate changes in the hypothalamo-pituitary-gonadal (HPG) axis. The extent of intra-species variation in seasonal timing of reproductive function is considerable, both within and among populations. Dark-eyed junco (Junco hyemalis) populations are known to differ in their reproductive timing response to cues experienced in the same habitat in late...

Background: Human Papilloma viruses (HPV) is the most common sexually transmitted infection (STI) and the most important pathogenic factor for cervical intraepithelial lesions and carcinoma therefore a significant source of morbidity and mortality worldwide. This study was designed to investigate reproductive and medical factors associated with HPV infection in women referred to Colposcopy clin...

This qualitative study in the Islamic Republic of Iran aimed to explore facilitators and barriers to the use of reproductive health services by unmarried women. A purposive sample of unmarried women aged 25-60 years in Isfahan city were interviewed about their experiences of reproductive health services in public health centres. Content analysis of responses revealed that the favourable charact...