BACKGROUND Many sexual psychophysiologic studies have failed to find differences in physiologic genital arousal between women with and those without sexual dysfunction. However, differences in self-reported (ie, perceived) measures of genital responses between these 2 groups of women have been noted. AIMS To determine whether women with and without sexual dysfunction differ on measures of phy...

Males and females frequently differ in their rates of ageing, but the origins of these differences are poorly understood. Sex differences in senescence have been hypothesized to arise, because investment in intra-sexual reproductive competition entails costs to somatic maintenance, leaving the sex that experiences stronger reproductive competition showing higher rates of senescence. However, ev...

Two recent studies have shown a relationship between “sexual orientation” and size of anterior hypothalamic nuclei; others that hypothalamic serotonin is involved in male sexual arousal and behavior. We hypothesized that serotonergic differences might parallel sexual orientation differences in the hypothalamus. Accordingly, we administered 40 mg of fluoxetine (in a counterbalanced design with p...

D ow n The bright colors of birds are often attributed to sexual selection on males, but in many species both sexes are colorful and it has been long debated whether sexual selection can also explain this variation. We show that most evolutionary transitions in color have been toward similar plumage in both sexes, and the color of both sexes (for example, bright or dull) was associated with ind...

Five measurements were taken on the ossa coxae of 454 adult primates representing Ceboidea, Cercopithecoidea and Hominoidea. Sex differences in these variables and their relationships to overall body size and sexual dimorphism were tested by means of Student's T-test and regression analysis. The study attempts to clarify the nature of primate pelvic sexual dimorphism, including allometric effec...

OBJECTIVE This study aimed to determine rates at which racial minority (i.e., non-White) and sexual minority (i.e., lesbian and bisexual-identified) women in the United States receive medical help to become pregnant. Income and insurance coverage discrepancies were hypothesized to mediate differences in receipt of medical help as a function of race and sexual orientation. METHOD Two studies c...

INTRODUCTION A number of questionnaires have been created to assess levels of sexual desire in women, but to our knowledge, there are currently no validated measures for assessing cues that result in sexual desire. A questionnaire of this nature could be useful for both clinicians and researchers, because it considers the contextual nature of sexual desire and it draws attention to individual d...

An article recently published in this journal (Cox, Devine, Bischmann, & Hyde, 2016) questioned the validity of existing research on the accurate judgment of sexual orientation from photographs of faces. Specifically, those authors reported a confound in their stimuli whereby the photos of sexual minorities (gay men and lesbians) were of higher quality than the photos of heterosexuals. Based on...