The developmental stress hypothesis: A special case of the evolution of condition-dependent sexual traits

The idea that sexually selected traits might be condition dependent is far from novel (Zahavi 1975); however, the developmental stress hypothesis was proposed as a special case because of a highly plausible mechanism: the development of the neural circuits controlling song output coincides with a period of time during which developing birds are likely to be susceptible to stress. The elegant aspect of the hypothesis is that the mechanism is defined and effects can be readily tested (Nowicki et al. 1998; Buchanan et al. 2003). Compared with more general hypotheses about the evolution of condition-dependent sexual traits (Buchanan 2000), the second particularly interesting aspect of the developmental stress hypothesis is that, in some species, individuals may suffer historical markers of stress. This is because in species with a fixed period for neural growth and song learning, there is no possibility for compensation in later life for stress experienced during early development. Females using such a marker of stress may benefit by obtaining a partner whose other cognitive functions have not been impaired by stress.

Assessment of first sexual intercourse in young women with a history of childhood sexual abuse

Women reporting childhood sexual abuse (CSA) that involved actual or attempted penetration may not identify this as their first sexual intercourse. Data were drawn from a population-based, prospective cohort study spanning adolescence to adulthood. CSA prior to age 16 and age of first sexual intercourse with a male were assessed retrospectively. More than half of women reporting CSA in the form of actual or penetrative abuse reported an age of first sexual intercourse at or beyond 16 years. Direct questioning about CSA is needed to accurately ascertain sexual history.

Childhood sexual abuse and adolescent eating disorder : findings from the Victorian Adolescent Health Cohort study

Objective: To examine the relationship between childhood sexual abuse (CSA) before the age of 16 years and later onset of bulimia and anorexia nervosa symptoms in females.

Design: A longitudinal cohort study of adolescents observed from August 1992 to March 2003. The cohort was defined in a 2-stage cluster sample using 44 Australian schools in Victoria.

Setting: Population based.

Participants: A total of 1936 persons participated at least once and survived to the age of 24 years, including 999 females. The mean (SD) age of females at the start of follow- up was 14.91 (0.39) years; and at completion, 24.03 (0.55) years.

Main Exposure: Self-reported CSA before the age of 16 years was ascertained retrospectively at the age of 24 years.

Outcome Measures: Incident Diagnostic and Statistical Manual of Mental Disorders (Fourth Edition)–defined partial syndromes of anorexia and bulimia nervosa were identified between waves 4 (mean age, 16.3 years) and 6 (mean age, 17.4 years) using the Branched Eating Disorder Test.

Results: The incidence of bulimic syndrome during adolescence was 2.5 (95% confidence interval, 0.80-8.0) times higher among those who reported 1 episode of CSA and 4.9 (95% confidence interval, 1.9-12.7) times higher among those who reported 2 or more episodes of CSA, compared with females reporting no episodes, adjusted for age and background factors. The association persisted after adjusting for possible confounders or mediators measured 6 months earlier, including psychiatric morbidity and dieting behavior. There was little evidence of an association between CSA and partial syndromes of incident anorexia nervosa.

Conclusion: Childhood sexual abuse seems to be a risk factor for the development of bulimic syndromes, not necessarily mediated by psychiatric morbidity or severe dieting.

Adolescent victims with an intellectual disability : perceived credibility in cases of sexual abuse

The study aimed to assess perceptions of the credibility of adolescent victims with intellectual disability. Results revealed that victim and participant characteristics influenced perceptions of the credibility of the victim and verdict responses. Findings related to the level of ID, type of offence, perceptions of competency, honesty, suggestibility, and gender of victim and participant.

Development and psychometric properties of the Female Sexual Desire Questionnaire (FSDQ)

Introduction.  Sexual desire is often evaluated as part of a global assessment of female sexual function, which may not comprehensively evaluate the various facets of this experience. There currently exists a need to develop a psychometrically robust desire-specific measure for women.

Aim.  The aim of this study was to develop and validate a desire-specific, self-administered instrument that evaluates the multiple facets of sexual desire and factors influencing this experience for partnered heterosexual women, with or without sexual dysfunction.

Methods.  Preliminary items for inclusion in the Female Sexual Desire Questionnaire (FSDQ) were identified through a literature review and individual interviews with partnered heterosexual women, mostly from Australia. The resulting instrument was completed by a validation sample of 741 women, aged between 18 and 71 years, who were involved in a heterosexual relationship of between 3 months' and 49 years' duration.

Main Outcome Measures.  Exploratory factor analysis was used to refine the FSDQ item content and identify the underlying domain structure. The reliability (internal consistency) and validity (convergent validity) of the FSDQ were also evaluated.

Results.  The final version of the FSDQ consisted of 50 items organized into six domains that characterized the experience of, and factors influencing, sexual desire for heterosexual partnered women: Dyadic Desire, Solitary Desire, Resistance, Positive Relationship, Sexual Self-Image, and Concern. Each domain demonstrated high reliability, as did the overall measure. Evidence of construct validity was ascertained through convergence with the Sexual Desire Inventory and the Hurlbert Index of Sexual Desire. A short-form of the FSDQ, consisting of six items, was also developed.

Conclusions.  The FSDQ is a new reliable and valid multidimensional measure designed specifically for evaluating the facets of, and factors influencing, sexual desire among sexually functional and dysfunctional women who are involved in a heterosexual relationship.

The effectiveness of an internet-based psychological treatment program for female sexual dysfunction

Introduction.  There has been limited evaluation of the effectiveness of psychological interventions for female sexual dysfunction (FSD). Furthermore, none of these studies have evaluated the effectiveness of these programs delivered over the Internet.

Aim.  The current study evaluated an Internet-based psychological treatment program for FSD. Revive consisted of three well-established and validated treatment components: communication skills training, sensate focus exercises, and regular contact with a therapist.

Main Outcome Measures.  Outcome measures included: the Female Sexual Function Index; the Depression, Anxiety, Stress Scale; the Sexual Function Scale; and the Personal Assessment of Intimacy in Relationships.

Methods.  In total, 39 women (17 in treatment group and 22 in control group) completed the program. The mean age for the treatment group was 34.91 (standard deviation [SD] = 10.27) and 33.30 years (SD = 9.34) for the control group.

Results.  The results demonstrated that women who completed treatment reported improved sexual and relationship functioning in comparison with those who received no treatment.

Conclusions.  These findings highlight the suitability of the Internet for providing psychological treatment for FSD and for targeting the individual and relationship factors often associated with these disorders.

Conditionally sexual : men and teenage boys with moderate to profound intellectual disability

This article presents qualitative research data about the sexuality of men and teenage boys with moderate to profound intellectual disability. Research findings pointed to a conditional construct of sexuality based within a biopsychosocial framework. The notion Conditionally Sexual represents the perceived limitations, within a rights-based discourse, of these men and teenage boys’ sexuality. The limitations to person-centred service delivery from a policy vacuum in the area of sexuality and intellectual disability represents a major challenge for paid staff. We suggest that a move toward better understanding how to support such a conditional sexual construct will assist the development of a healthy masculine sexuality for men and boys with intellectual disability.

Reversed sexual dimorphism and altered prey base : the effect on sooty owl (Tyto tenebricosa tenebricosa) diet

The ecology and function of many Australian predators has likely been disrupted following major changes in prey base due to declines in distribution and abundance of small mammals following European settlement. This study investigated various aspects of the dietary ecology of sooty owls (Tyto tenebricosa tenebricosa), including sexual variation as they potentially exhibit the greatest degree of reversed sexual dimorphism of any owl species worldwide. Sooty owls are highly opportunistic predators of non-volant small mammals, consuming most species known to exist in the region, so their diet fluctuates seasonally and spatially due to varying prey availability, and is particularly influenced by the breeding cycles of prey. Significant intersexual dietary differences existed with female sooty owls predominantly consuming much larger prey items than males, with dietary overlap at 0.62. The current reliance on relatively few native mammalian species is of conservation concern, especially when mammal declines are unlikely to have ceased as many threatening processes still persist in the landscape. Sooty owl conservation appears inextricably linked with small mammal conservation. Conservation efforts should be focussed towards improving prey densities and prey habitat, primarily by implementing control programs for feral predators and preventing the loss of hollow-bearing trees throughout the landscape

Demographic and psychological factors related to sexual desire among heterosexual women in a relationship

This study examined demographic, psychological, and relationship factors that are associated with the experience of sexual desire in women. The contribution of other aspects of sexual function on sexual desire was also investigated. The participants were 741 partnered heterosexual women (mean age¼45.7 years), who completed the Female Sexual Desire Questionnaire online, which evaluated their levels of sexual desire, as well as a range of individual and dyadic variables. For each of the six aspects of sexual desire assessed, the number and frequency of problems in other aspects of women’s sexual functioning were the most common predictors. The results demonstrated that sexual desire was lower among older, postmenopausal women and those who had been in their current relationship for a longer period of time. Women who reported that their partner experienced a sexual dysfunction also obtained lower sexual desire scores. These findings demonstrate the strong interrelationship between the different phases of the sexual response cycle for women. Further, they suggest that sexual dysfunction in one partner is likely to be associated with sexual dysfunction in the other partner. The clinical implications of these findings in terms of the treatment for sexual dysfunction among women (and their partners) are discussed.

At what age can females consent to sexual activity? A survey of jury-eligible Australians

One suggested reason for the low conviction rates of alleged child sexual abuse offenders relates to the attitudes and beliefs the public hold about such victims; sexual interactions starting at an earlier age; and because the oversexualisation of children and teenagers portrayed in the media may have affected perceptions as to when females are capable ofgiving consent to sexual interactions. A sample of 580 jury-eligible participants completed six implicit questions via an online survey regarding females' capacity to consent. While participants had similar perceptions in response to the type of question asked, there were some differences due to respondent group. When significant differences were observed, women had significantly lower estimates of the age at which female adolescents can make informed decisions about sexual activity than men, as did respondents who had children and were older. Working with children had little impact. The legal implications of these findings are discussed.

Long-term species, sexual and individual variations in foraging strategies of fur seals revealed by stable isotopes in whiskers

Background: Individual variations in the use of the species niche are an important component of diversity in trophic interactions. A challenge in testing consistency of individual foraging strategy is the repeated collection of information on the same individuals.

Methodology/Principal Findings: The foraging strategies of sympatric fur seals (Arctocephalus gazella and A. tropicalis) were examined using the stable isotope signature of serially sampled whiskers. Most whiskers exhibited synchronous delta C-13 and delta N-15 oscillations that correspond to the seal annual movements over the long term (up to 8 years). delta C-13 and delta N-15 values were spread over large ranges, with differences between species, sexes and individuals. The main segregating mechanism operates at the spatial scale. Most seals favored foraging in subantarctic waters (where the Crozet Islands are located) where they fed on myctophids. However, A. gazella dispersed in the Antarctic Zone and A. tropicalis more in the subtropics. Gender differences in annual time budget shape the seal movements. Males that do not perform any parental care exhibited large isotopic oscillations reflecting broad annual migrations, while isotopic values of females confined to a limited foraging range during lactation exhibited smaller changes. Limited inter-individual isotopic variations occurred in female seals and in male A. tropicalis. In contrast, male A. gazella showed large inter-individual variations, with some males migrating repeatedly to high-Antarctic waters where they fed on krill, thus meaning that individual specialization occurred over years.

Conclusions/Significance: Whisker isotopic signature yields unique long-term information on individual behaviour that integrates the spatial, trophic and temporal dimensions of the ecological niche. The method allows depicting the entire realized niche of the species, including some of its less well-known components such as age-, sex-, individual- and migration-related changes. It highlights intrapopulation heterogeneity in foraging strategies that could have important implications for likely demographic responses to environmental variability.