Sexual responsiveness of college students to rape depictions: Inhibitory and disinhibitory effects.

Conducted 2 experiments with a total of 436 undergraduates to identify the specific dimensions in portrayals of sexual violence that inhibit or disinhibit the sexual responsiveness of male and female college students. Exp I replicated earlier findings that normals are less sexually aroused by portrayals of sexual assault than by depictions of mutually consenting sex. In Exp II, it was shown that portraying the rape victim as experiencing an involuntary orgasm disinhibited Ss' sexual responsiveness and resulted in levels of arousal comparable to those elicited by depictions of mutually consenting sex. Surprisingly, however, it was found that although female Ss were most aroused when the rape victim was portrayed as experiencing an orgasm and no pain, males were most aroused when the victim experienced an orgasm and pain. The relevance of these data to pornography and to the common belief among rapists that their victims derive pleasure from being assaulted is discussed. Misattribution, identification, and power explanations of the findings are also discussed. Finally, it is suggested that arousing stimuli that fuse sexuality and violence may have antisocial effects. (37 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The role of sexual arousal in sexually aggressive behavior: A meta-analysis.

Meta-analyses were performed on 9 studies of 434 Ss' penile responsivity to rape stimuli. The mean effect size for raw score data suggested that most sexual aggressors against women exhibit slightly more rape arousal than control or comparison Ss, whereas the mean effect size for rape index (rape arousal:consenting sexual arousal) data suggested a moderate between-groups difference. Rape index effect sizes in individual studies, however, were heterogeneous. The rape index appears sensitive to differences between sexually aggressive men and those who are not but is not sensitive to differences between men who sexually aggress against women vs other types of sexual aggressors. Also discussed are the needs for standardization and methodological and statistical improvements. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Sexual arousal to erotic and aggressive stimuli in sexually coercive and noncoercive men.

Sexual arousal to erotic stimuli depicting various levels of force were examined among college men. Study 1 used phallometric indices to measure penile circumferential change during combined audiotape and slide presentations varying in degree of force. The results indicated that the sexually coercive group exhibited more penile tumescence than controls to scenes involving verbal pressure and verbal threats. Analyses across time blocks suggested that control participants inhibited sexual arousal with the introduction of force cues but that the sexually coercive group did not. Study 2 was a replication of Study 1 without slides. Both groups showed increases in penile tumescence in response to the consent scenario. Only the sexually coercive men demonstrated significant tumescence in response to force scenarios. The results indicated that the sexually coercive males had a lower threshold for arousal to sexual cues and did not inhibit sexual arousal when force cues were introduced. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Phosphofructokinase interacts with molecular chaperonins GroEL and GroES

OBJECTIVE: The present investigation was designed to provide the first empirical examination of the effects of clonidine, a selective alpha 2-adrenergic agonist, on sexual arousal in women with and without prior sympathetic nervous system [SNS] stimulation by exercise. The purpose was to help elucidate the influence of adrenergic mechanisms on sexual function in women. METHODS: Thirty sexually functional women participated in two experimental sessions in which subjective (self-report) and physiological (vaginal photoplethysmograph) sexual responses to erotic stimuli were measured after either clonidine (0.2 mg) or placebo administration in a randomized, double-blind, crossover protocol. Before viewing the experimental films, 15 subjects engaged in 20 minutes of intense exercise designed to elicit significant SNS activation. RESULTS: Clonidine significantly decreased vaginal pulse amplitude, vaginal blood volume, and subjective sexual responses to the erotic films in subjects who were in a state of heightened (via exercise), but not baseline (no exercise) SNS arousal. CONCLUSIONS: Clonidine can significantly inhibit subjective and physiological sexual arousal in women. These findings have implications for deriving an etiological theory of sexual function in women and for understanding the effects of psychotherapeutic drugs on female sexual function.     

Causes of sexual dysfunction: The role of anxiety and cognitive interference.

Research findings have implicated 5 factors that seem to differentiate sexually functional Ss from sexually dysfunctional Ss suffering from inhibited sexual excitement. These factors include differences in affect during sexual stimulation, differences in self-reports of sexual arousal and perception of control over arousal, distractibility during sexual stimulation, and differential sexual responding while anxious. These findings suggest a working model of sexual dysfunction that is based on cognitive interference and anxiety. According to this model, dysfunctional Ss show an inappropriate attentional focus that involves attending to the consequences of not performing or some other issue not directly related to erotic cues. Neutral distracting stimuli inhibit the arousal of sexually functional but not sexually dysfunctional Ss. Implications of this model for the treatment of sexual dysfunction are suggested. (68 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Alcohol, sexual arousal, and the transfer of excitation.

Investigations of the alcohol-related disinhibition of responses to deviant sexual stimuli suggest that the pharmacological actions of ethanol have little influence on the disinhibition process. The mere belief that alcohol is consumed is sufficient to induce increased sexual arousal. Studies with conventional stimuli, however, suggest that interactions occur between the pharmacological presence of ethanol and the psychological expectations of its presence. The present article examines the contribution of pharmacological, cognitive, and environmental variables to perceived sexual arousal. Pictures that elicited either a low or moderate level of self-reported sexual arousal were viewed and evaluated by 64 men and 64 women after completing their drinks. The evaluations and arousal measures suggested significant Instruction by Content by Arousal interactions. The strongest perceptions of arousal occurred among Ss who did not know they were drinking alcohol. When Ss were unaware of the alcohol intoxication, the pharmacological excitation induced by alcohol transferred to the perception and evaluation of the slides. (33 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Effects of alcohol and cognitive set on sexual arousal to deviant stimuli.

48 undergraduate male social drinkers were randomly assigned to 1 of 2 expectancy set conditions in which they were led to believe that the beverage they were administered contained alcohol or no alcohol. For half of the Ss in each expectancy condition, the beverage was an alcoholic malt liquor; the others drank a nonalcoholic malt beverage. After their drinks, changes in penile tumescence (PT) in response to normal and deviant tape recordings and to self-generated fantasy were measured physiologically by a mercury-in-rubber strain gauge. The cognitive set (expectancy) significantly increased PT in response to the various erotic recordings. Alcohol did not significantly influence levels of sexual arousal. Ss who believed they had consumed an alcoholic beverage evidenced significantly more arousal to the forcible rape recording and to the sadistic stimuli than Ss who believed that they had consumed a nonalcoholic beverage, regardless of the actual contents of the beverage. The cognitive set, as well as the alcohol, significantly influenced heart rate, skin temperature, and subjective reports of sexual arousal. Self-report measures of sexual arousal were positively correlated with PT. Mosher Forced-Choice Guilt Inventory scores were not significantly correlated with PT, although the Sex Guilt subscore was negatively correlated with the subjective measure of sexual arousal for the heterosexual intercourse and forcible rape tapes. (35 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Sexually aggressive and nonaggressive men: Sexual arousal and judgments in response to acquaintance rape and consensual analogues.

Self-identified sexually aggressive (SA) and nonaggressive (NA) college men listened to audiotape analogues of consensual sexual intercourse and acquaintance rape. Phallometric and decision-latency methodology was used to examine sexual arousal and decisions to stop sexual advances in each scenario. Both groups showed increases in penile response to the consensual scenario. Consistent with the inhibition model of sexual aggression, the SA group showed greater sexual arousal and failed to inhibit responding when force was introduced in the rape, whereas the NA group exhibited less arousal and greater inhibition to force. The SA group allowed the rape to continue significantly longer than the NA group. These effects were greatly magnified in SA men who endorsed high calloused sexual beliefs, implying that a cognitive set that justifies sexual aggression and lacks victim empathy may disinhibit sexual arousal and potentiate coercive decision making. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Sexual arousal to rape and consenting depictions: The importance of the woman's arousal.

143 male and female undergraduates were randomly assigned to read 1 of 8 versions of an erotic passage. The independent variables in the stories were nonconsent vs consent, woman's arousal vs disgust, and woman's pain vs no pain. Sex of S was the 4th independent variable. Data indicate that both in terms of experimentally manipulated variables and individual within-cell perceptual differences, the outcome dimension (arousal vs disgust) was the only variable that significantly affected Ss' sexual arousal. Portrayals that depicted the woman as experiencing sexual arousal, irrespective of whether they portrayed rape or consenting interactions, were reported by Ss to be more sexually stimulating than those depicting disgust. (12 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Neural correlates of sexual arousal in homosexual and heterosexual men.

Men exhibit much higher levels of genital and subjective arousal to sexual stimuli containing their preferred sex than they do to stimuli containing only the nonpreferred sex. This study used event-related functional magnetic resonance imaging to investigate how this category-specific pattern would be reflected in the brains of homosexual (n = 11) and heterosexual (n = 11) men. Comparisons of activation to preferred sexual stimuli, nonpreferred sexual stimuli, and sports stimuli revealed large networks correlated with sexual arousal, spanning multiple cortical and subcortical areas. Both homosexual and heterosexual men exhibited category-specific arousal in brain activity. Within the amygdala, greater preference-related activity was observed in homosexual men, but it is unclear whether this is a cause or a consequence of their sexuality. In a subsequent analysis of regions hypothesized to support arousal, both participant groups demonstrated widespread increases in evoked activity for preferred stimuli. Aggregate data from these regions produced significant differences between stimulus types in 16 out of 22 participants. Significant activational differences matched reported sexual orientation in 15 of these 16 participants, representing an advance in psychophysiological measures of arousal. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Sexual arousal to rape depictions: Individual differences.

145 male undergraduates participated (a) in an orientation session in which personality variables, sexual motivations, sexual experience, and self-reported likelihood of raping were assessed and (b) in a laboratory session in which they listened to 1 of 8 audiotaped depictions of an interaction involving sexual acts between a man and a woman. The content of these depictions was systematically manipulated along the dimensions of consent, pain, and outcome. Later in the 2nd session, Ss listened to a 2nd audiotaped portrayal of either nonconsenting or consenting sex. Their sexual arousal was assessed throughout this 2nd session by penile tumescence and self-reports. Results highlight the importance of the interaction between individual differences variables and manipulations in the content of the portrayals in affecting sexual arousal to rape depictions. Support was obtained for the prediction that such arousal is not an isolated response but is associated with other measures of sexually aggressive tendencies. (44 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Risk recognition and trauma-related symptoms among sexually revictimized women.

This study used experimental methodology to investigate the differential impact of various levels of sexual victimization on women's perceptions of risk and evaluative judgments of sexual assault within a dating interaction. Single- and multiple-incident victims were compared with nonvictims. Results supported the hypothesis that revictimized women would exhibit longer latencies than either single incident victims or nonvictims in signaling that an audiotaped date rape should be halted. Revictimized women with greater posttraumatic stress disorder (PTSD) symptoms, arousal symptoms in particular, exhibited latencies similar to those of nonvictims, whereas revictimized women with lower levels of PTSD symptoms had significantly longer latencies. Dissociative symptoms were not related to latency These findings suggest that PTSD-related arousal symptoms may serve a buffering effect, increasing sensitivity to threat cues that portend a sexually coercive interaction. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Evaluation of a sexual assault prevention program.

The purpose of this investigation was to empirically evaluate a sexual assault prevention program. Of the 360 female college students who participated in the investigation, 181 students were in the treatment group and 165 students were in the control group. Although the program was not effective in decreasing the incidence of sexual assault for women with a sexual assault history, it was effective in decreasing the incidence of sexual assault for women without a sexual assault history. The program also led to a decrease in dating behaviors found to be associated with acquaintance rape and an increase in knowledge about sexual assault for the treatment group. The implications of these results for future preventive efforts are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

A test of reciprocal inhibition: are anxiety and sexual arousal in women mutually inhibitory?

Tested J. Wolpe's (1958) prediction that autonomic sexual and anxiety arousal states are mutually inhibitory. Using a new physiological measure of female sexual arousal (vaginal blood volume), changes in 7 sexually experienced Ss (mean age 27 yrs) were compared during erotic video stimulation following anxiety and control stimulus preexposure and during anxiety and control stimulation following erotic stimulus preexposure. Consistent with reciprocal inhibition theory, when Ss were sexually aroused by erotic preexposure, anxiety arousal inhibited sexual arousal more rapidly than did an attention control stimulus. However, contrary to reciprocal inhibition theory, Ss became more rapidly aroused sexually following anxiety preexposure than following neutral preexposure. In the case of heart rate, changes were compared during erotic and neutral stimulation following anxiety preexposure and during anxiety arousal following erotic and neutral preexposure. Consistent with the literature to date, there were no heart rate changes that could be attributed to differential preexposure. Taken together, the results do not support Wolpe's reciprocal inhibition theory but do suggest a context interpretation: The way in which sexual and anxiety arousal states interact with each other may depend on the context in which Ss perceive the stimuli that generate these respective arousal states. The clinical implications of the findings are discussed. (27 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

A Longitudinal Examination of Male College Students' Perpetration of Sexual Assault.

Self-administered surveys were completed by 197 men in college at 2 time points, 1 year apart. Men who committed sexual assault at multiple time points (repeat assaulters) had the most extreme scores on measures of hostility toward women, past sexual experiences, drinking in sexual situations, and adolescent delinquency. Nonassaulters had the least extreme scores and men who committed sexual assault at only 1 time point had scores that tended to fall in between. Repeat assaulters also expressed significantly less remorse when they described their sexual assault at Time 1 than did past assaulters who committed sexual assault only at the initial time point. These findings demonstrate the importance of initiating prevention and treatment programs in early adolescence, before longstanding attitudes and behaviors tolerant of sexual assault are established. (PsycINFO Database Record (c) 2010 APA, all rights reserved)