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https://www.readbyqxmd.com/read/28432814/do-males-choose-their-mates-in-the-lekking-moth-achroia-grisella-influence-of-female-body-mass-and-male-reproductive-status-on-male-mate-choice
#1
Marlène Goubault, Rebecca Burlaud
Lekking males aggregate to attract females and contribute solely to egg fertilization, without any further parental care. Evolutionary theory therefore predicts them to be non-choosy towards their mates, because any lost mating opportunities would outweigh the benefits associated with such preferences. Nevertheless, due to time costs, the production of energetically costly sexual displays, and potential sperm limitation, the mating effort of lekking males is often considerable. These factors, combined with the fact that many females of varying quality are likely to visit leks, could favor the evolution of male mate preferences...
April 22, 2017: Insect Science
https://www.readbyqxmd.com/read/28425895/understanding-sexual-orientation-and-health-in-canada-who-are-we-capturing-and-who-are-we-missing-using-the-statistics-canada-sexual-orientation-question
#2
Christoffer Dharma, Greta R Bauer
OBJECTIVE: Public health research on inequalities in Canada depends heavily on population data sets such as the Canadian Community Health Survey. While sexual orientation has three dimensions - identity, behaviour and attraction - Statistics Canada and public health agencies assess sexual orientation with a single questionnaire item on identity, defined behaviourally. This study aims to evaluate this item, to allow for clearer interpretation of sexual orientation frequencies and inequalities...
April 20, 2017: Canadian Journal of Public Health. Revue Canadienne de Santé Publique
https://www.readbyqxmd.com/read/28424743/towards-bi-inclusive-policies-suggestions-based-on-research-on-dutch-same-sex-attracted-young-people
#3
Jantine van Lisdonk, Saskia Keuzenkamp
Dutch national LGBT policies are not bi-inclusive and this study provides suggestions for improvement, based on empirical research. Attention for bisexuality in policy appears simply to pay lip service and to endorse the construction of sexual orientation as a hetero/homo binary. The outcomes of our survey (n = 1449) and in-depth interviews (n = 38) of Dutch same-sex attracted young people suggest that special attention for bisexual people is warranted. Compared to exclusively same-sex attracted participants, the equally both-sex attracted participants scored worse on openness about their sexual attraction, visibility discomfort, perceived acceptance, and suicide attempts...
2017: Sexuality Research & Social Policy
https://www.readbyqxmd.com/read/28419833/sexual-selection-sexual-isolation-and-pheromones-in-drosophila-melanogaster-strains-after-long-term-maintaining-on-different-diets
#4
Jelena Trajković, Dragana Miličić, Tatjana Savić, Sofija Pavković-Lučić
Evolution of reproductive isolation may be a consequence of a variety of signals used in courtship and mate preferences. Pheromones play an important role in both sexual selection and sexual isolation. The abundance of pheromones in Drosophila melanogaster may depend on different environmental factors, including diet. The aim of this study was to ascertain to which degree principal pheromones affect sexual selection in D. melanogaster. We used D. melanogaster strains reared for 14 years on four substrates: standard cornmeal substrate and those containing tomato, banana and carrot...
April 15, 2017: Behavioural Processes
https://www.readbyqxmd.com/read/28413431/asian-house-rats-may-facilitate-their-invasive-success-through-suppressing-brown-rats-in-chronic-interaction
#5
Hong-Ling Guo, Hua-Jing Teng, Jin-Hua Zhang, Jian-Xu Zhang, Yao-Hua Zhang
BACKGROUND: The Asian house rat (Rattus tanezumi) and the brown rat (Rattus norvegicus) are closely related species and are partially sympatric in southern China. Over the past 20 years, R. tanezumi has significantly expanded northward in China and partially replaced the native brown rat subspecies, R. n. humiliatus. Although invasive species are often more aggressive than native species, we did not observe interspecific physical aggression between R. tanezumi and R. n. humiliatus. Here, we focused on whether or not R...
2017: Frontiers in Zoology
https://www.readbyqxmd.com/read/28406649/born-this-way-sexual-orientation-beliefs-and-their-correlates-in-lesbian-and-bisexual-women
#6
James S Morandini, Alexander Blaszczynski, Daniel S J Costa, Alexandra Godwin, Ilan Dar-Nimrod
In this study, we examined how beliefs about the nature and origin of sexual orientation were associated with sexual identity outcomes, namely internalized sexual stigma and sexual orientation uncertainty, and in turn, psychological well-being in sexual minority women. A community sample of 393 lesbian and 205 bisexual women were recruited for a cross-sectional online survey. Using multigroup structural equation modeling, we examined whether believing sexual orientation to be inborn/immutable (i.e., natural) and/or as existing in discrete categories (i...
April 13, 2017: Journal of Counseling Psychology
https://www.readbyqxmd.com/read/28406176/male-alliance-behaviour-and-mating-access-varies-with-habitat-in-a-dolphin-social-network
#7
Richard C Connor, William R Cioffi, Srđan Randić, Simon J Allen, Jana Watson-Capps, Michael Krützen
Within-species variation in social structure has attracted interest recently because of the potential to explore phenotypic plasticity and, specifically, how demographic and ecological variation influence social structure. Populations of bottlenose dolphins (Tursiops spp.) vary in male alliance formation, from no alliances to simple pairs to, in Shark Bay, Western Australia, the most complex nested alliances known outside of humans. Examination of ecological contributions to this variation is complicated by differences among populations in other potentially explanatory traits, such as phylogenetic distance, as well as female reproductive schedules, sexual size dimorphism, and body size...
April 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28405372/putative-sex-specific-human-pheromones-do-not-affect-gender-perception-attractiveness-ratings-or-unfaithfulness-judgements-of-opposite-sex-faces
#8
Robin M Hare, Sophie Schlatter, Gillian Rhodes, Leigh W Simmons
Debate continues over the existence of human sex pheromones. Two substances, androstadienone (AND) and estratetraenol (EST), were recently reported to signal male and female gender, respectively, potentially qualifying them as human sex pheromones. If AND and EST truly signal gender, then they should affect reproductively relevant behaviours such as mate perception. To test this hypothesis, heterosexual, Caucasian human participants completed two computer-based tasks twice, on two consecutive days, exposed to a control scent on one day and a putative pheromone (AND or EST) on the other...
March 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/28401792/assessment-of-long-term-mate-preferences-in-iran
#9
Mohammad Atari
Previous research suggests that assessment of mate preferences has received relatively little psychometric attention from researchers, particularly in non-Western cultures. The current research was designed to (1) extend previous findings on long-term mate preferences by using a qualitative strategy, (2) develop a psychometrically sound scale for assessment of long-term mate preferences in men, and (3) develop a sex-neutral scale for assessment of long-term mate preferences. Six dimensions of mate preferences emerged for men: F = family/domesticity, A = attractiveness/sexuality, K = kindness/dependability, E = education/intelligence, R = religiosity/chastity, and S = status/resources...
April 2017: Evolutionary Psychology: An International Journal of Evolutionary Approaches to Psychology and Behavior
https://www.readbyqxmd.com/read/28398158/community-influences-on-mormon-women-with-same-sex-sexuality
#10
Jeanna Jacobsen
The idea of community evokes a sense of belonging and connectedness with others. Community life can, however, be troublesome for those who are part of a community that rejects their sexual identity. This paper presents findings from a phenomenological study that involved in-depth interviews with 23 same-sex-attracted Mormon women. Themes emerged around community experience, including sub-themes related to influence of congregations and geographic location. In addition, themes of loss of community and the rebuilding of community were explored...
April 11, 2017: Culture, Health & Sexuality
https://www.readbyqxmd.com/read/28391967/physicians-talking-about-sex-sexuality-and-protection-with-adolescents
#11
REVIEW
Lindsay Fuzzell, Cleveland G Shields, Stewart C Alexander, J Dennis Fortenberry
Adolescent-physician communication about sexual behaviors, sexuality, and protective behaviors is vital for the support of sexual minorities and the prevention of sexually transmitted infections and unintended pregnancies. The objective of this review is to identify sexual topics that physicians and adolescents discuss during medical encounters and examine the quantity and quality of that communication. We performed a systematic literature review of major databases through May 2016. We identified 33 papers that focused on adolescent-physician communication about three major sexual health topics: coital or noncoital sexual behaviors, sexual orientation or attractions, and sexually protective or preventative behaviors...
April 5, 2017: Journal of Adolescent Health: Official Publication of the Society for Adolescent Medicine
https://www.readbyqxmd.com/read/28380126/factors-associated-with-violence-against-female-sex-workers-in-ten-brazilian-cities
#12
Francisca Sueli da Silva Lima, Edgar Merchán-Hamann, Margarita Urdaneta, Giseli Nogueira Damacena, Célia Landmann Szwarcwald
Few studies in Brazil have focused on violence against female sex workers, a theme that has attracted researchers' attention worldwide, especially due to possible associations with HIV. The current study aims to estimate the prevalence of violence against female sex workers according to type and perpetrator and to identify associated factors. A cross-sectional study was conducted with data on 2,523 female sex workers from ten Brazilian cities, and with the respondent-driven sampling (RDS). Prevalence of verbal violence was 59...
March 30, 2017: Cadernos de Saúde Pública
https://www.readbyqxmd.com/read/28375807/sexual-willingness-with-same-and-other-sex-prospective-partners-experimental-evidence-from-the-bar-scene
#13
Breanne R Helmers, Collin Harbke, Julie C Herbstrith
Sex is ubiquitous in the media but only a fraction depicts sexual interactions between same-sex partners. This field study, conducted outside of bars in the Midwestern United States, examined 83 heterosexuals' sexual willingness with a same- or other-sex partner. Participants viewed a randomly assigned video vignette of a same- or other-sex partner. Alcohol intake, partner attractiveness, and sexual willingness were measured. Using moderated regression analysis, we found that alcohol intake predicted sexual willingness with the male target for both men and women, but not with the female target...
April 4, 2017: Journal of Social Psychology
https://www.readbyqxmd.com/read/28375747/-if-only-you-were-a-boy%C3%A2-friendship-and-sexual-identity-in-mireille-best-s-hymne-aux-mur%C3%A3-nes
#14
Stephanie Schechner
While much French fiction devoted to lesbians focuses on romantic relationships, Mireille Best's (1943-2005) first novel, Hymne aux Murènes (Hymn to the Moray Eels) (1986), depicts a wide variety of relationships between the lesbian protagonist, Mila, and the other young women staying in a sanatorium of sorts for the treatment of an unnamed illness. In this all-female environment, Best depicts relationships between Mila and Paule, a closeted lesbian employee of the sanatorium; between Mila and young women like Josette and Lilli, who are somewhat attracted to Mila but, for the most part, do not act on this attraction; and between very close heterosexual friends (Nicoli and Nicola)...
April 4, 2017: Journal of Lesbian Studies
https://www.readbyqxmd.com/read/28374065/prenatal-exposure-to-progesterone-affects-sexual-orientation-in-humans
#15
June M Reinisch, Erik Lykke Mortensen, Stephanie A Sanders
Prenatal sex hormone levels affect physical and behavioral sexual differentiation in animals and humans. Although prenatal hormones are theorized to influence sexual orientation in humans, evidence is sparse. Sexual orientation variables for 34 prenatally progesterone-exposed subjects (17 males and 17 females) were compared to matched controls (M age = 23.2 years). A case-control double-blind design was used drawing on existing data from the US/Denmark Prenatal Development Project. Index cases were exposed to lutocyclin (bioidentical progesterone = C21H30O2; M W : 314...
April 3, 2017: Archives of Sexual Behavior
https://www.readbyqxmd.com/read/28362218/implicit-and-explicit-attitudes-toward-sex-and-romance-in-asexuals
#16
Maria Bulmer, Keise Izuma
Despite the recent surge of interest in sexuality, asexuality has remained relatively underresearched. Distinct from abstinence or chastity, asexuality refers to a lack of sexual attraction toward others. Past research suggests asexuals have negative attitudes toward sex, though no research has examined implicit attitudes. While preliminary evidence suggests that many asexuals are interested in engaging in romantic relationships, these attitudes have yet to be examined thoroughly, implicitly, or compared with a control group...
March 31, 2017: Journal of Sex Research
https://www.readbyqxmd.com/read/28361243/asexual-identity-in-a-new-zealand-national-sample-demographics-well-being-and-health
#17
Lara M Greaves, Fiona Kate Barlow, Yanshu Huang, Samantha Stronge, Gloria Fraser, Chris G Sibley
Academic interest in asexuality has increased in recent years; however, there is yet to be a national probability study exploring the correlates of self-identifying as asexual. Here, we utilized data from the 2014/15 New Zealand Attitudes and Values Study. Past research has typically used attraction-based measures; however, we asked participants to describe their sexual orientation using a self-generated, open-ended item, and 0.4% (n = 44) self-identified as asexual. We then compared self-identified asexual participants with a heterosexual reference group (n = 11,822) across a large number of demographic, psychological, and health variables...
March 30, 2017: Archives of Sexual Behavior
https://www.readbyqxmd.com/read/28358924/processing-and-targeting-of-proteins-derived-from-polyprotein-with-2a-and-lp4-2a-as-peptide-linkers-in-a-maize-expression-system
#18
He Sun, Ni Zhou, Hai Wang, Dafang Huang, Zhihong Lang
In the transformation of multiple genes, gene fusion is an attractive alternative to other methods, including sexual crossing, re-transformation, and co-transformation, among others. The 2A peptide from the foot-and-mouth disease virus (FMDV) causes the co-translational "cleavage" of polyprotein and operates in a wide variety of eukaryotic cells. LP4, a linker peptide that originates from a natural polyprotein occurring in the seed of Impatiens balsamina, can be split between the first and second amino acids in post-translational processing...
2017: PloS One
https://www.readbyqxmd.com/read/28358859/vocalizations-of-female-frogs-contain-nonlinear-characteristics-and-individual-signatures
#19
Fang Zhang, Juan Zhao, Albert S Feng
Anuran vocalization is sexually dimorphic, with males doing the bulk of vocalizing. Female vocalization is rare and has been observed in a handful of species, including the concave-eared torrent frog (Odorrana tormota). Females O. tormota have been reported to emit moderate-level calls to attract males. In contrast to males, female's vocal signals show no evidence of nonlinear phenomena (NLP). However, with females emitting calls so infrequently that this conclusion must be considered tentative in light of the limited supporting data...
2017: PloS One
https://www.readbyqxmd.com/read/28357525/sexual-trajectories-of-lesbian-gay-and-bisexual-adults-in-the-netherlands
#20
Hanneke de Graaf, Charles Picavet
Studies on sexual trajectories of lesbian, gay, and bisexual (LGB) people generally focus on the first same-sex attraction and sexual experience, and their relation to self-identification and coming out as LGB. Relational and opposite-sex experiences are generally not taken into account. The aim of this study was to provide a more comprehensive overview of LGBs' sexual trajectories and to distinguish subsamples with different trajectories. A sample of same-sex attracted members of an online research panel (N = 3054) completed a sexual health questionnaire, including items about the timing of sexual and relational milestones...
March 29, 2017: Archives of Sexual Behavior
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