Biological factors in human sexuality

Morphological and ultrastructural features of the laryngeal mound of Egyptian Cattle Egret (Bubulcus ibis, Linnaeus, 1758)

Background

According to our acknowledgment this is the first full anatomical description of the studied laryngeal mound of the Egyptian Cattle Egret (Bubulcus ibis, Linnaeus, 1758). This study was obtained with the aid of scanning electron microscopy (SEM) and histological techniques. Heads of ten healthy adult male Egyptian cattle egrets were used in this study.

Results

The laryngeal mound (Mons laryngealis) was a pear-shaped musculoskeletal elevation. It represented 20.55 and 67.87% of the total length of the oropharyngeal floor and the pharyngeal floor, respectively. By SEM view, the lateral aspect of the caudal third of the laryngeal mound had a serrated mucosal appearance, forming of 6–7 finger-like projections. Furthermore, the terminal part of the laryngeal mound (except the middle part) was bordered a transverse row of pyramidal-shaped papillae, which demarcated from the esophagus. Histologically, laryngeal salivary glands termed (cricoarytenoid salivary glands) of the laryngeal mound were simple tubular type and were arranged in one row within the lamina propria connective tissue close to the lamina epithelialis. Those glands were surrounded by abundant aggregation of lymphocytes, extended overlying the surface lining epithelium. The glottis within the laryngeal mound was supported by hyaline cartilages; dorsally by paired arytenoid cartilages, ventrolaterally by cricoid cartilage, and caudodorsally by procricoid cartilage. Two groups of intrinsic laryngeal skeletal muscles have connected the cartilages. The glandular epithelium of the laryngeal salivary glands and chondrocytes of the laryngeal cartilages showed strongly positive alcian blue reaction.

Conclusions

The laryngeal mound shows certain features that are unique as an adaptation to lifestyles and bird’s habitat.

Neurochemical and Hormonal Contributors to Compulsive Sexual Behavior Disorder

Purpose of Review

Compulsive sexual behavior disorder has been recently included in the 11th revision of the International Classification of Diseases (ICD-11), and the possible contribution of neurochemical and hormonal factors have been reported. However, relatively little is known concerning the neurobiology underlying this disorder. The aim of this article is to review and discuss published findings in the area.

Recent Findings

Evidence suggests that the neuroendocrine systems are involved in the pathophysiology of compulsive sexual behavior. The hypothalamus-pituitary adrenal axis, the hypothalamus-pituitary–gonadal axis, and the oxytocinergic system have been implicated.

Summary

Further studies are needed to elucidate the exact involvement of neuroendocrine and hormonal systems in compulsive sexual behavior disorder. Prospective longitudinal studies are particularly needed, especially those considering co-occurring psychiatric disorders and obtaining hormonal assessments in experimental circumstances with appropriate control groups.

Study protocol for a randomised controlled trial to evaluate the effectiveness of a serious game targeting interpersonal emotion regulation in early adolescents

Background

Adaptive interpersonal emotion regulation (iER) is a vital tool for positive relations. During early adolescence, peer relations become increasingly important, making this age group a relevant target group for interventions promoting positive interactions with each other, yet no evidence-based intervention exists for iER and early adolescents specifically.

Methods

This randomised controlled trial (RCT) aims to test effectiveness and feasibility of a serious game training iER skills in early adolescents by comparing outcomes with a control group playing a game without psychoeducational content in a pre- and post-test design. German- and English-speaking early adolescents (10–14 years) are eligible for participation. IER skills improvement as assessed by a vignette task is the primary outcome and will be analysed with a chi-square test. Secondary outcomes include feasibility and acceptability, emotional competence, personal emotion regulation, gender, and sex.

Discussion

This RCT will test whether playing a serious game about iER strategies results in an improvement of iER skills and whether the game is feasible and acceptable for early adolescents with the ultimate aim to implement the game in schools and help early adolescents achieve positive peer relationships.

Trial registration

ClinicalTrials.govNCT04808102, Registered on 19 March 2021

Foundations of Erobotics

Technology is giving rise to artificial erotic agents, which we call erobots (erôs + bot). Erobots, such as virtual or augmented partners, erotic chatbots, and sex robots, increasingly expose humans to the possibility of intimacy and sexuality with artificial agents. Their advent has sparked academic and public debates: some denounce their risks (e.g., promotion of harmful sociosexual norms), while others defend their potential benefits (e.g., health, education, and research applications). Yet, the scientific study of human-machine erotic interaction is limited; no comprehensive theoretical models have been proposed and the empirical literature remains scarce. The current research programs investigating erotic technologies tend to focus on the risks and benefits of erobots, rather than providing solutions to resolve the former and enhance the latter. Moreover, we feel that these programs underestimate how humans and machines unpredictably interact and co-evolve, as well as the influence of sociocultural processes on technological development and meaning attribution. To comprehensively explore human-machine erotic interaction and co-evolution, we argue that we need a new unified transdisciplinary field of research-grounded in sexuality and technology positive frameworks-focusing on human-erobot interaction and co-evolution as well as guiding the development of beneficial erotic machines. We call this field Erobotics. As a first contribution to this new discipline, this article defines Erobotics and its related concepts; proposes a model of human-erobot interaction and co-evolution; and suggests a path to design beneficial erotic machines that could mitigate risks and enhance human well-being.

Neuroanatomy and function of human sexual behavior: A neglected or unknown issue?

INTRODUCTION

Sexual desire, arousal, and orgasm are mediated by complex, yet still not fully understood, interactions of the somatic and autonomic nervous systems operating at the central and peripheral levels. Disruption of endocrine, neural, or vascular response, caused by aging, medical illness, neurological diseases, surgery, or drugs, can lead to sexual dysfunctions, thus significantly affecting patients' quality of life.

PURPOSE

This narrative review aims at characterizing the involvement of the central nervous system in human sexual behavior.

METHODS

A literature search was conducted using PubMed in its entirety up to June 2018, analyzing the studies dealing with the neurobiological and neurophysiological basis of human sexuality.

RESULTS

Sexual behavior is regulated by both subcortical structures, such as the hypothalamus, brainstem, and spinal cord, and several cortical brain areas acting as an orchestra to finely adjust this primitive, complex, and versatile behavior. At the central level, dopaminergic and serotonergic systems appear to play a significant role in various factors of sexual response, although adrenergic, cholinergic, and other neuropeptide transmitter systems may contribute as well.

CONCLUSIONS

Providing healthcare professionals with information concerning sexual behavior may overcome useless and sometimes dangerous barriers and improve patient management, since sexual well-being is considered one of the most important aspects of one's quality of life.

Sex-Differentiated Changes in Sexual Desire Predict Marital Dissatisfaction

Sex is critical to marriage. Yet, there are several reasons to expect spouses to experience declines in the desire for sex over time, and the rates of any declines in sexual desire may differ for men and women. We used two multi-wave, longitudinal studies to test whether male and female members of newlywed couples experienced different rates of change in sexual desire, whether any such changes were accentuated by childbirth, and whether any such changes had implications for marital satisfaction. In both studies, spouses provided multiple reports of sexual desire, marital satisfaction, and childbirth. Results demonstrated that women's sexual desire declined more steeply over time than did men's sexual desire, which did not decline on average. Further, childbirth accentuated this sex difference by partially, though not completely, accounting for declines in women's sexual desire but not men's. Finally, declines in women's but not men's sexual desire predicted declines in both partners' marital satisfaction. These effects held controlling depressive symptoms and stress, including stress from parenthood. The current findings offer novel longitudinal evidence for sex-differentiated changes in sexual desire and therefore suggest an important source of marital discord.

Composing Sexuality in the Midst of Adolescent Cancer

A cancer diagnosis heralds the onset of significant life changes. The various experiences of diagnosis, treatment, and recovery from cancer during adolescence and young adulthood are complex and disruptive. Emphasis on treatment and recovery often overshadows other social and developmental imperatives for adolescents and young adults. Acknowledging, exploring, and crafting one’s own sexual identity is a significant milestone achieved during this time, and it is one that is interrupted by the arrival and treatment of cancer. There is value in understanding how adolescents and young adults compose sexuality amid cancer experiences, and how this composition contributes to their ongoing stream of life experiences after recovery. As part of a larger study of sexuality and adolescent cancer, we undertook a narrative inquiry with Anna and Mark, two young adults who experienced cancer during adolescence. Over 14 months, we met with Anna and Mark, drawing on different narrative inquiry approaches to explore their past and ongoing experiences and to build negotiated stories of those experiences. We explored resonant threads between the stories, which help show the depth and complexity of sexuality as it is experienced in the midst of and after cancer. Two resonant threads are discussed: inward and outward looking, and sexuality and survival. The inquiry reveals the richness of self-composition amid competing stories of cancer treatment, disruptions to family and socialization, survivorship, what it means to be a young man or woman in the world, and the sense of a developing sexual self.

"Family Is Who They Say They Are"a: Examining the Effects of Cancer on the Romantic Partners of Adolescents and Young Adults

In this article, we discuss a study we conducted to examine the effects of cancer on romantic partners (i.e., boyfriends and girlfriends, social/romantic/intimate partners) of adolescents and young adults experiencing, or who have experienced, cancer. In this hermeneutic study, we interviewed partners who were involved with an adolescent/young adult with cancer, a cancer survivor who was in a relationship during his treatment, and two healthcare professionals who have worked with these couples and witnessed many other situations of impact, effect, and repercussion. Out of this study, we suggest that partners are affected in many ways that can vary from estrangement, to termination of the relationship, to premature decisions about remaining in the relationship, to family disregard of the partner, and to disregard of the family due to influence of, or relationship with, the partner. We discuss these findings within the context of the larger picture of the psychosocial relational impact of cancer on members beyond those in the immediate and biological family.

Cultural factors and sexual dysfunction in clinical practice

Attitudes to sex and the perceived role of sexual activity are very strongly influenced by cultural values. Culturally determined gender roles influence relationships between different-sex partners, and cultural values affect attitudes towards sexual variation. Cultures define what is deviant and from where help is sought. Through differing patterns of child-rearing, cultures also affect individuals' cognitive development, world views and explanatory models of emotional distress. It is critical that clinicians are aware of the role of culture in defining sexual dysfunction and how cultural factors can be used in initiating treatment as well as in therapeutic engagement and alliance. Although epidemiological data on prevalence of sexual dysfunction across cultures are scanty, it is likely that prevalences vary, as will pathways into care and patterns of help-seeking. In this article we discuss the potential impact of culture on sexual dysfunction, and issues that clinicians, whether in specialist or in general services, need to be aware of in assessing and treating patients who present with sexual dysfunction.

"A Tribe Apart": Sexuality and Cancer in Adolescence

This qualitative study employed hermeneutic phenomenology and narrative inquiry to examine the topic of sexuality and adolescents with cancer from the perspectives of survivors who had experienced cancer as adolescents. This investigation examined the potentially sensitive, disquieting, and often taboo issue of sexuality in the interest of optimizing wellness in young people, and, ultimately, in the health of adults. Understanding the adolescent body as a sensitive, sexual, and developing self can enrich our understanding of adolescent cancer and promote best health care and practices, examining ways that we might mitigate the long-term effects of arrested or delayed development of sexual identity. In this article, we discuss phase 1 of the study, which used hermeneutics as the method of inquiry. Findings included a general experience of adolescents having a sense of "losing themselves" while at the same time finding themselves in a new light. Other findings include the connection between sexuality, self, and identity; the unique "tribe" of adolescents with cancer; the necessity for sexuality to take a backseat to cancer; the changing mirror images from self and others; sexuality and fertility; and, ultimately, that sexuality is a relational experience.

Women's Endorsement of Models of Sexual Response: Correlates and Predictors

Few studies have investigated endorsement of female sexual response models, and no single model has been accepted as a normative description of women's sexual response. The aim of the study was to establish how women from a population-based sample endorse current theoretical models of the female sexual response--the linear models and circular model (partial and composite Basson models)--as well as predictors of endorsement. Accordingly, 174 heterosexual women aged 18-55 years were included in a cross-sectional study: 74 women diagnosed with female sexual dysfunction (FSD) based on DSM-5 criteria and 100 non-dysfunctional women. The description of sexual response models was used to divide subjects into four subgroups: linear (Masters-Johnson and Kaplan models), circular (partial Basson model), mixed (linear and circular models in similar proportions, reflective of the composite Basson model), and a different model. Women were asked to choose which of the models best described their pattern of sexual response and how frequently they engaged in each model. Results showed that 28.7% of women endorsed the linear models, 19.5% the partial Basson model, 40.8% the composite Basson model, and 10.9% a different model. Women with FSD endorsed the partial Basson model and a different model more frequently than did non-dysfunctional controls. Individuals who were dissatisfied with a partner as a lover were more likely to endorse a different model. Based on the results, we concluded that the majority of women endorsed a mixed model combining the circular response with the possibility of an innate desire triggering a linear response. Further, relationship difficulties, not FSD, predicted model endorsement.

Organizing lesbian/queer bathhouse events: Emerging forms of sexual experience

Discussions of public sexual spaces in the social science literature have, until recently, been dominated by analyses of men's use of these spaces for erotic expression. In the late 1990s, feminist collectives began to explore the emancipatory potentials these spaces can have for lesbian sexualities. After a police raid on one such event called the "Pussy Palace," scholars in diverse disciplines began to explore how these events have both opened up and restricted erotic possibilities for lesbians, queer women, and trans* attendees. This article reviews the existing social science literature on lesbian and queer bathhouse events and highlights several key themes and subthemes that have dominated the discourse, including the importance that these spaces be recognized for their ability to both shape and be shaped by principles of community, safety, and sexual health/wellness.

The medicalization of love

Pharmaceuticals or other emerging technologies could be used to enhance (or diminish) feelings of lust, attraction, and attachment in adult romantic partnerships. Although such interventions could conceivably be used to promote individual (and couple) well-being, their widespread development and/or adoption might lead to the 'medicalization' of human love and heartache--for some, a source of a serious concern. In this essay, we argue that the medicalization of love need not necessarily be problematic, on balance, but could plausibly be expected to have either good or bad consequences depending upon how it unfolds. By anticipating some of the specific ways in which these technologies could yield unwanted outcomes, bioethicists and others can help to direct the course of love's medicalization--should it happen to occur--more toward the 'good' side than the 'bad.'

Can sexual offenders be treated?

There are many misconceptions about sexual offender treatment. This is not only a problem in the lay press and media but is also a problem amongst mental health professionals. In part, this relates to the inadequate teaching about sexual deviation in medical schools and psychiatric residency programs and even in forensic psychiatric fellowships. Other disciplines, such as psychology, have educated mental health professionals in a more balanced way related to the assessment and treatment of sexual offenders but still the understanding, knowledge and acceptance that sexual offender treatment is available, is evidence-based, and is successful as shown in treatment outcome studies is still misunderstood. This review covers the evidence-based studies that support the efficacy of sexual offender treatment.

Rape Avoidance Behavior among Slovak Women

Rape has been a recurrent adaptive problem for many species, including humans. Rape is costly to women in terms of disease transmission, partner abandonment, and unwanted pregnancy (among other costs). Therefore, behavioral strategies which allow women to avoid coercive men may have been favored by selection. In line with this evolutionary reasoning, the current research documented that physically stronger women and those in a committed romantic relationship reported more rape avoidance behavior. In addition, virgin women tended to perform more rape avoidance behavior compared with their non-virgin counterparts. Women with high conception risk perceived themselves as physically stronger, which may protect them against a potential rapist. Fear of unwanted pregnancy from rape decreased as age increased, reflecting higher fertility among younger participants. However, older women reported more rape avoidance behavior, which contradicts evolutionary predictions. The results provide some support for evolutionary hypotheses of rape avoidance behavior which suggest that woman's perception of rape is influenced by parental investment and perceived physical condition.

Life history of female preferences for male faces: a comparison of pubescent girls, nonpregnant and pregnant young women, and middle-aged women

Although scientific interest in facial attractiveness has developed substantially in recent years, few studies have contributed to our understanding of the ontogeny of facial preferences. In this study, attractiveness of 30 male faces was evaluated by four female groups: girls at puberty, nonpregnant and pregnant young women, and middle-aged women. The main findings are as follows: (1) Preference for sexy-looking faces was strongest in young, nonpregnant women. (2) Biologically more mature girls displayed more adultlike preferences. (3) The intragroup consistency for postmenopausal women was relatively low. (4) In terms of the preference pattern, pregnant women were more similar to perimenopausal women than they were to their nonpregnant peers. (5) Preference for youthful appearance decreased with the age of the women. I argue that the life history of female preferences for male faces is, to a large extent, hormone-driven and underpinned by a set of evolutionary adaptations.

Child maltreatment histories among female inmates reporting inmate on inmate sexual victimization in prison: the mediating role of emotion dysregulation

Despite data indicating that child maltreatment (CM) in various forms is associated with adult sexual victimization among community women, few studies have explicitly explored how types of CM might relate to prison sexual victimization. Because little is known about how CM might give rise to prison sexual victimization, the present study also examined emotion dysregulation emanating from early abuse experiences as a potential mediator in the link between early CM and inmate-on-inmate prison sexual victimization. Approximately 168 incarcerated women completed self-report inventories assessing various types of childhood maltreatment, emotion dysregulation, and coerced or forced sexual experiences in prison. Nearly 77% of the sample endorsed experiencing at least one form of CM, with 64% of inmates reporting that they experienced two or more forms of CM. Approximately 9% of inmates reported sexual coercion and 22% reported a forced sexual experience in prison. Each form of CM was associated with prison sexual coercion; however, fewer associations emerged between CM and forced prison sexual experiences. Emotion dysregulation was found to mediate links between CM, particularly co-occurring CM, and sexual coercion in prison, but it was unrelated to forced prison sexual experiences. Implications are discussed.

Timetable of effects of testosterone administration to hypogonadal men on variables of sex and mood

INTRODUCTION

The effects of testosterone have been extensively characterized, but little attention has been given to the timetable of occurrence of the various effects of testosterone.

METHODS

The timetables of effects on sexual and psychological variables in 40 hypogonadal men receiving treatment with either parenteral testosterone enanthate (TE) or undecanoate (TU).

RESULTS

Sexual thoughts/fantasies and sexual interest/desire/spontaneous morning erections emerged quickly and plateaued after 3 weeks. Total erections rose to a maximum over 9 weeks and then plateaued. Ejaculations per week/satisfaction with sex life rose over the first 3 weeks, increasing steadily to a plateau at 12 weeks. Depression scores decreased to reach a plateau after 6 weeks. Aggressiveness did not change. Scores of concentration improved and reached a plateau after 3 weeks in the group treated with TE and after 9 weeks in the group treated with TU. Good mood improved after 6-9 weeks. Positive effects on self-confidence appeared between 3-6 weeks and on fatigue after 9-12 weeks.

CONCLUSION

Insight into the emergence of effects may be useful information for the patient and for the attending physician in monitoring clinical effects of testosterone treatment of hypogonadal men.

Masturbation in urban China

This study examined the prevalence and sources of masturbatory practice in a nationally representative sample from China completed in the year 2000, with analysis of sources focused on 2,828 urban respondents aged 20-59. In this subpopulation, 13% (95% CI, 10-18) of women and 35% (CI, 26-44) of men reported any masturbation in the preceding year. Prevalence for people in their 20s was higher, and closer to US and European levels, especially for men. Particularly for women, masturbation not only compensated for absent partners but also complemented the high sexual interests of a subset of participants. For both women and men, practicing masturbation appeared to be a two-step process. In the first step, events such as sexual contact in childhood, early puberty, and early sex were related to sexualization and the "gateway event" of adolescent masturbation. In the second step, other factors, such as liberal sexual values and sexual knowledge, further increased the current probability of masturbation. Overall, the results suggest that masturbation is readily adopted even at more modest levels of economic and social development, that masturbation is often more than simply compensatory behavior for regular partnered sex, that masturbatory patterns are heavily influenced by early sexualization, and that a complex model is needed to comprehend masturbatory practice, particularly for women.

Biologic perspective on early erotic development

Neurobiologic researchers can understand children's sexuality in less moral and more biologic terms. Genetically programmed levels of neurotransmitters and hormones establish a baseline trajectory of erotic interest and activity across the lifespan. Environmental influences also contribute. Intense early stimulation can affect the brain and create a condition of hyper eroticism, whereas too little stimulation can limit the ability to bond and impair the sexual response. Children who are erotically challenged or challenging are viewed correctly as having a brain imbalance, rather than as victims or as being morally deficient. This should pave the way for more humane, objective, and effective interventions.