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... does not lead to insemination in all cases, and insemination does not always lead to fertilization. Because sperm is rarely deposited directly onto the eggs by the male, it is ultimately the female that determines if the sperm is utilized to fertilize her eggs in the majority of situations. Sexual s ...
... does not lead to insemination in all cases, and insemination does not always lead to fertilization. Because sperm is rarely deposited directly onto the eggs by the male, it is ultimately the female that determines if the sperm is utilized to fertilize her eggs in the majority of situations. Sexual s ...
Adaptation to Sperm Competition in Humans
... (Baker & Bellis, 1993). Inseminating into a female more sperm following a separation may function to outnumber or ‘‘flush out’’ sperm from rival men that may be present in the reproductive tract of the woman. Inspired by Baker and Bellis’s (1993) demonstration of male physiological adaptations to sp ...
... (Baker & Bellis, 1993). Inseminating into a female more sperm following a separation may function to outnumber or ‘‘flush out’’ sperm from rival men that may be present in the reproductive tract of the woman. Inspired by Baker and Bellis’s (1993) demonstration of male physiological adaptations to sp ...
Research Article The Evaluation of Sexual Functions and Sex
... with endocrinopathies were excluded from the study. ...
... with endocrinopathies were excluded from the study. ...
1 Emotional Responses to Casual Sex Experiences: The
... Despite past research showing that there are a multitude of motives for engaging in casual sex, this study reveals that different reasons for engaging in a one-night stand can be represented under broad motivational labels. For example, a physical-based need, such as the desire to satisfy sexual urg ...
... Despite past research showing that there are a multitude of motives for engaging in casual sex, this study reveals that different reasons for engaging in a one-night stand can be represented under broad motivational labels. For example, a physical-based need, such as the desire to satisfy sexual urg ...
KS Gender Identity Biological Basis review
... than in the general population, but neither was controlled. In the first, karyotype abnormalities were found in 2.5% of the 368 transgender individuals studied.[30] A second study of 302 transgender individuals also showed a low overall incidence (1.5%) of chromosomal abnormalities.[31] Twin Studies ...
... than in the general population, but neither was controlled. In the first, karyotype abnormalities were found in 2.5% of the 368 transgender individuals studied.[30] A second study of 302 transgender individuals also showed a low overall incidence (1.5%) of chromosomal abnormalities.[31] Twin Studies ...
The effects of sexual selection and ecology on adaptation and
... novel environments (and hence niche expansion), though this is not particularly well understood (Rundle et al. 2006, Whitlock and Agrawal 2009). In my thesis, I address two understudied aspects of sexual selection and its impacts on evolution: the alignment of natural and sexual selection, and how e ...
... novel environments (and hence niche expansion), though this is not particularly well understood (Rundle et al. 2006, Whitlock and Agrawal 2009). In my thesis, I address two understudied aspects of sexual selection and its impacts on evolution: the alignment of natural and sexual selection, and how e ...
Polyandry and sex-specific gene expression
... as testis size under polyandry comes at a cost to immune function [53 –55]. We might also expect elevated levels of purifying selection on both the gene sequence and gene expression patterns related to sperm production [56,57]. In mating systems with no or very little sperm competition, males need o ...
... as testis size under polyandry comes at a cost to immune function [53 –55]. We might also expect elevated levels of purifying selection on both the gene sequence and gene expression patterns related to sperm production [56,57]. In mating systems with no or very little sperm competition, males need o ...
Backlash From the Bedroom: Stigma Mediates
... Gender differences in sexual attitudes and behaviors are common, and among these, gender differences in preferences for casual sex are among the largest and best documented (see Peplau, 2003; Petersen & Hyde, 2010, for reviews). Current explanations of gender differences in casual sex focus largely ...
... Gender differences in sexual attitudes and behaviors are common, and among these, gender differences in preferences for casual sex are among the largest and best documented (see Peplau, 2003; Petersen & Hyde, 2010, for reviews). Current explanations of gender differences in casual sex focus largely ...
Conditioning and Sexual Behavior: A Review
... others of which will not. With sexual experience, initially ineffective stimuli become associated with behaviorally significant ones and thereby come to elicit sexually relevant responses. Second, initially neutral stimuli that are arbitrary and separated physically from the UCS can, through contigu ...
... others of which will not. With sexual experience, initially ineffective stimuli become associated with behaviorally significant ones and thereby come to elicit sexually relevant responses. Second, initially neutral stimuli that are arbitrary and separated physically from the UCS can, through contigu ...
Habitat heterogeneity favours asexual reproduction in natural
... the second approach, we took advantage of experimental hay meadows where grass diversity was manipulated via fertilization and irrigation treatments (Andrey et al. 2014). The original purpose of these treatments was to investigate the effects of fertilization and irrigation on the biodiversity of ex ...
... the second approach, we took advantage of experimental hay meadows where grass diversity was manipulated via fertilization and irrigation treatments (Andrey et al. 2014). The original purpose of these treatments was to investigate the effects of fertilization and irrigation on the biodiversity of ex ...
ASSOCIATION OF PRENATAL ANDROGEN EXPOSURE WITH
... it was found that homosexual men had lower 2D:4D ratios in samples with predominantly White participants, while homosexual men had higher 2D:4D ratios in samples that did not contain predominantly White participants. 2D:4D and Women Women are rarely the focus of 2D:4D research, and the studies that ...
... it was found that homosexual men had lower 2D:4D ratios in samples with predominantly White participants, while homosexual men had higher 2D:4D ratios in samples that did not contain predominantly White participants. 2D:4D and Women Women are rarely the focus of 2D:4D research, and the studies that ...
The factors influencing transactional sex among
... least half the countries included in the initial analyses, we then explore the effects of the other predictor variables exclusively for young women ages 15–24. Table 6 presents the results of the reduced model for sexually active 15–24 year old women. As can be seen in Table 6, while there are some ...
... least half the countries included in the initial analyses, we then explore the effects of the other predictor variables exclusively for young women ages 15–24. Table 6 presents the results of the reduced model for sexually active 15–24 year old women. As can be seen in Table 6, while there are some ...
Sex and Stereotyping in Sin City: A Content Analysis of Las Vegas
... (and reproduce) gender traits” (p. 380). Due to the fact that these ads are embedded in social, political, and economic institutions, gender-based inequalities are formed and reinforced. Advertising plays a contributing role by repeated exposure of images and messages that reinforce stereotypes. The ...
... (and reproduce) gender traits” (p. 380). Due to the fact that these ads are embedded in social, political, and economic institutions, gender-based inequalities are formed and reinforced. Advertising plays a contributing role by repeated exposure of images and messages that reinforce stereotypes. The ...
People Who Inject Drugs in Intimate Relationships
... compared to the WP arm (IRR of 0.49; 95% CI=[0.17, 1.55]; p=0.2) HCV Incidence : Person-year incidence rates by condition: 19.9% for Wellness Promotion 7.4% for Risk Reduction Over the one-year follow-up period, 69% reduction in HCV among participants in the RR arm, compared to WP (IRR of 0.31; 95% ...
... compared to the WP arm (IRR of 0.49; 95% CI=[0.17, 1.55]; p=0.2) HCV Incidence : Person-year incidence rates by condition: 19.9% for Wellness Promotion 7.4% for Risk Reduction Over the one-year follow-up period, 69% reduction in HCV among participants in the RR arm, compared to WP (IRR of 0.31; 95% ...
Genetic analysis of orgasmic function in twins and siblings does not
... by-product theory (Barash 2005; Judson 2005). In a subsequent study addressing these concerns, Wallen & Lloyd (2008) claimed to provide evidence for the by-product theory by showing that human clitoris length was proportionally more variable than penis length, purportedly demonstrating stabilizing s ...
... by-product theory (Barash 2005; Judson 2005). In a subsequent study addressing these concerns, Wallen & Lloyd (2008) claimed to provide evidence for the by-product theory by showing that human clitoris length was proportionally more variable than penis length, purportedly demonstrating stabilizing s ...
paper (pdf 1.16 MB) - Australian Institute of Criminology
... extramarital sex, multiple partners, etc.) and ‘unnatural’ practices (e.g. anal and oral sex, homosexuality) • undermine physical, emotional and ...
... extramarital sex, multiple partners, etc.) and ‘unnatural’ practices (e.g. anal and oral sex, homosexuality) • undermine physical, emotional and ...
HIV/AIDS in Michigan January 1, 2009
... that have been used for displaying HIV transmission risk in the Michigan and national HIV/AIDS statistics since the 1980’s. When the transmission categories were created, the order from top to bottom was meant to represent the most likely route through which HIV was transmitted, and thus implies tha ...
... that have been used for displaying HIV transmission risk in the Michigan and national HIV/AIDS statistics since the 1980’s. When the transmission categories were created, the order from top to bottom was meant to represent the most likely route through which HIV was transmitted, and thus implies tha ...
14_chapter 5
... Turtles have been the subject of numerous morphometric and growth studies. Morphometrics are commonly used to aid in identification of sex as well as age, growth, and other characteristics of turtles such as colour variation (Berry and Shine, 1980; Claude et al., 2003; Lovich et al., 1990). The rela ...
... Turtles have been the subject of numerous morphometric and growth studies. Morphometrics are commonly used to aid in identification of sex as well as age, growth, and other characteristics of turtles such as colour variation (Berry and Shine, 1980; Claude et al., 2003; Lovich et al., 1990). The rela ...
OrgasmiC DiffiCulties in WOmen Chapter 12
... 2. She enjoyed sexual experiences with a partner for the closeness but never felt much sexual enjoyment 3. She never tried masturbation 4. She read little or nothing about sex and orgasm 5. She talked to virtually no one about these subjects Today, women who are concerned about the absence of or ...
... 2. She enjoyed sexual experiences with a partner for the closeness but never felt much sexual enjoyment 3. She never tried masturbation 4. She read little or nothing about sex and orgasm 5. She talked to virtually no one about these subjects Today, women who are concerned about the absence of or ...
Combining the Methods of Differential and Experimental Psychology
... complex terms like “gender” which beg these questions, but to use the scientifically-precise term “sex” which is neutral with respect to such rival interpretations of observed male/female differences. Sex differences in psychological functions are typically studied by methods employing only those of ...
... complex terms like “gender” which beg these questions, but to use the scientifically-precise term “sex” which is neutral with respect to such rival interpretations of observed male/female differences. Sex differences in psychological functions are typically studied by methods employing only those of ...
Sexual Differences in Flight Calls and the Cue for Vocal Sex
... birds, the ability to discriminate Flight Calls of both sexesplays a major role in sexidentification of the Swinhoe’s Storm-Petrel. It is considered that there are clear-cut sexual differences in the call structure of Flight Calls because of the few errors in sex recognition. Analyses of call rhythm ...
... birds, the ability to discriminate Flight Calls of both sexesplays a major role in sexidentification of the Swinhoe’s Storm-Petrel. It is considered that there are clear-cut sexual differences in the call structure of Flight Calls because of the few errors in sex recognition. Analyses of call rhythm ...
effects of natural and sexual selection on adaptive population
... populations (Endler 1977; Smith et al. 1997; Hendry et al. 2000; Gavrilets 2004; Coyne and Orr 2004). However, gene flow constrains adaptive divergence, and the resulting population differences will therefore reflect the balance between the diversifying effects of natural selection and the homogeniz ...
... populations (Endler 1977; Smith et al. 1997; Hendry et al. 2000; Gavrilets 2004; Coyne and Orr 2004). However, gene flow constrains adaptive divergence, and the resulting population differences will therefore reflect the balance between the diversifying effects of natural selection and the homogeniz ...
Persistent versus late Onset among Female Offenders
... chances of engaging in delinquent behavior (Heimer 1996). In addition, higher familial responsibilities are also placed on females at an earlier age, further curtailing criminal behavior (Bottcher 2001). Due to both higher levels of supervision and increased responsibilities, girls have less time to ...
... chances of engaging in delinquent behavior (Heimer 1996). In addition, higher familial responsibilities are also placed on females at an earlier age, further curtailing criminal behavior (Bottcher 2001). Due to both higher levels of supervision and increased responsibilities, girls have less time to ...