In the sex-pheromone communication systems of moths, odorant receptor (Or) specificity as well as higher olfactory information processing in males should be finely tuned to the pheromone of conspecific females. Accordingly, male sex-pheromone preference should have diversified along with the diversification of female sex pheromones; however, the genetic mechanisms that facilitated the diversifi...

This study in Egypt, measured the son preference index, its determinants, and impact on reproductive behaviour and intention of 400 mothers attending for delivery. Overall son preference index was 1.4. The causes of sex preference were mainly psychological and social. Mothers with only girls were 496 times more likely to prefer a son as compared to those with boys only. Mothers with illiterate ...

OBJECTIVE The paper explores the population effects of male preference stopping rules and of alternative combinations of fertility rates and male-biased birth sex ratios. METHODS The ‘laboratory’ is a closed, stable population with five age groups and a dynamic process represented by a compact Leslie matrix. The new element is sex-selective abortion. We consider nine stopping rules, one with no...

What determines the preference for sons evident in abnormal sex ratios at birth in countries such as India and China? Is the son preference just a reflection of the prevailing economic environment, notably poverty, few economic opportunities for women, and largely rural economies? If so, we would expect these patterns to vanish with economic development. In this paper, we study South-East Asian...

Patients' preferences for physicians of a particular sex tend to skew sex distributions of clinical populations in training and practice settings. A study was developed to explore these preferences and potential reasons for them. Of 185 adult patients surveyed at four family practice residency clinics, 45% expressed a preference for sex of physician; 43% of women and 12% of men preferred a fema...

Faces are an important cue to multiple physiological and psychological traits. Human preferences for exaggerated sex typicality (masculinity or femininity) in faces depend on multiple factors and show high inter-subject variability. To gain a deeper understanding of the mechanisms underlying facial femininity preferences in men, we tested the interactive effect of family structure (birth order,...