The effect of stimulus content on volunteering for sexual interest research among college students

Much of the literature on volunteer bias in sexual interest research has been limited to either identifying variables on which volunteers differ from nonvolunteers or examining how the intrusiveness of the meaurement device affects volunteer rates. The present study was designed to examine whether stimulus content would affect volunteer rates and volunteer/non‐volunteer differences in a large sample of college students (206 men and 358 women). The study also sought to determine whether such findings could also apply to research that recruits from exclusively heterosexual samples. Students completed questionnaires in small groups and were asked whether they would be willing to volunteer for studies that would involve viewing and rating five different types of sexually explicit images (nude men, nude women, heterosexual behavior, male homosexual behavior, and female homosexual behavior). Results indicate that men and women differed in the types of images that they would volunteer to view, based upon the content of the images. Furthermore, volunteers for each type of image reported significantly greater self‐monitoring as well as sexual and general sensation seeking than did nonvolunteers, while differences on other measures were less consistent. Discussion is given to specific ways in which the findings and gen‐eralizability of sexual interest study results can be affected.     

The effects of secondary stimulus characteristics on men's sexual arousal

The penile plethysmograph is believed by many researchers and clinicians to be the most valid and reliable instrument currently available for assessing male sexual arousal patterns. Stimuli used to elicit sexual arousal in research studies as well as in plethysmographic assessments, however, have varied considerably. We examined the effects of two stimulus characteristics that may greatly influence the measurement of male sexual arousal—the type of sexual behavior depicted and the presence of accompanying audio cues. The sexual arousal of 18 male college students was individually assessed via penile plethysmograph and self‐report while they viewed 60‐second erotic video clips. Each video clip depicted a single sexual behavior; half of the clips were presented with accompanying audio. Separate 2 (sound) x 6 (behavior) x 2 (session) repeated measures ANOVAs revealed significant main effects for sound and behavior for both the physiological and self‐report data, as well as a significant sound x behavior interaction for the self‐report data. The physiological data and self‐report data were also highly correlated (r = .78). Results are discussed in the context of implications for male sexual arousal research and penile plethysmographic assessments.     

Social cognitions about adult male victims of female sexual assault

Although men are far less likely than women to be victims of heterosexual assault, such cases have been reported with increasing frequency in recent years. We compared social judgments about male and female victims of heterosexual and homosexual rape and tested hypotheses concerning social cognitions that are assumed to underlie a male rape mythology. In a 2 × 2 × 2 design, 77 male and 89 female subjects made a series of judgments about a sexual assault case in which sex of victim and sex of assailants were manipulated. Consistent with the hypotheses, the male victim of sexual assault by females was judged more likely to have initiated or encouraged the sex acts, and more enjoyment and less stress were attributed to him. This pattern of results was more pronounced among male subjects. The results are discussed in relation to stereotypic beliefs concerning male sex roles, sexual motivation, and sexual functioning that are likely to affect the social cognitions of both observers and male victims of heterosexual assault.     

Individual Differences in the Effects of Mood on Sexuality: The Revised Mood and Sexuality Questionnaire (MSQ-R)

Previous research using the Mood and Sexuality Questionnaire (MSQ) has revealed substantial variability in how negative mood impacts sexual response and behavior. However, the MSQ does not address differences between desire for solo or partnered sexual activity, examine the effects of sexual activity on mood, or assess the effects of positive mood. This article presents the development and factor structure of the Revised Mood and Sexuality Questionnaire (MSQ-R). An exploratory factor analysis in a sample of heterosexual men, homosexual men, and heterosexual women (N = 1,983) produced eight factors. Considerable variability was found in how moods influence sexual desire and arousal, in the effects of mood on sexual behavior, and in the reciprocal effects of sexual activity on mood. Among other findings, heterosexual women were less likely than heterosexual men and homosexual men to experience increased sexual desire and arousal when anxious or stressed, whereas homosexual men and heterosexual women were less likely than heterosexual men to experience increased desire when sad or depressed. Heterosexual men and heterosexual women were more likely than homosexual men to report increased desire when in a positive mood. Intercorrelations and correlations with various sexual behaviors varied by group. Limitations and implications of the findings are discussed.     

Effects of erotic guided imagery on female sexual arousal and emotional response

The discrepancy between survey findings that women require a romantic context for arousal to erotica and the results of laboratory research which have failed to confirm this effect has led to continued controversy over the role of context in female sexual arousal. Methodological criticisms of laboratory research have focused on the passive nature of cue manipulations utilized to create casual versus committed contexts and failure to validate the effectiveness of context manipulations. The present study investigated the effects of erotic guided imagery on female sexual arousal in committed and casual contexts. Sixty‐five women listened to tapes of erotic guided imagery. Participants imagined either themselves or another woman engaging in a committed or casual sexual relationship. Dependent variables consisted of three measures of subjective sexual arousal and the Differential Emotions Scale. A self‐report measure revealed that subjects clearly differentiated the two contexts. Examination of mean scores on the dependent variables indicated that all subjects were sexually aroused by the guided imagery, experienced moderate interest and enjoyment, and experienced minimal negative emotional responses. Multivariate analysis of variance revealed no significant differences for the main effects of context, person, or the interaction between person and context. The findings reaffirm previous laboratory research indicating that women do not require a committed context as a prerequisite for sexual arousal and positive emotional response to imagined erotic stimuli     

The cut sleeve 1 revisited: A brief ethnographic interview with a male homosexual in mainland China

This paper focuses on a brief interview with a self‐disclosed male homosexual from a Western province in mainland China. While others have reported on homosexuality in China, the sources of information have generally been nonreactive (letters and clinical case notes). To the author's knowledge, this is the first documented face‐to‐face interview with a Chinese male homosexual to reach the Western professional press. Segments chosen for focus include the self‐perceptions of the individual, his sexual orientation and liaisons, and the manner in which he negotiates his alternate lifestyle in a cultural system largely negative to homosexuality in any form. While this example is obviously not representative of homosexuals in China, it does briefly illustrate the kinds of experiences that confront a male homosexual in the post‐Mao Zedong era. Adaptive strategies by this individual also indicate how the expression of a sexual orientation at variance from the norm can be sustained, even in a seemingly closed system.     

Determinants of sexual arousal and the accuracy of its self‐estimation in sexually functional males

Men with and without sexual dysfunction present with varying patterns of agreement between subjective estimates of sexual arousal and more objective psychophysiological measures of the same construct. This relative accuracy seems to be associated with sexual function, with men who have sexual dysfunction presenting less accurate estimations (mostly reporting below measured arousal levels). The purpose of this study is to clarify the processes underlying sexual arousal and the accuracy of its self‐estimation. We looked at potential predictors of sexual arousal (subjective and physiological) and accuracy in estimating objective sexual arousal in a sample of 60 sexually functional males. Predictors included pre‐existing sexual attitudes (erotophobia), both trait and state positive and negative affect, self‐focused attention, and interoceptive awareness. Results indicate that this sexually functional sample generally reported below their own erection level. Interestingly, trait negative affect was associated with somewhat lower levels of subjective arousal and higher levels of physiological arousal. On the other hand, state positive affect facilitated both subjective and objective arousal and increased somewhat the accuracy of estimates of erectile responding. Pre‐existing sexual attitudes as well as variations in self‐focused attention and interoceptive awareness evidenced little effect on sexual arousal or the accuracy of its estimation.     

Puerto rican drug users’ experiences of physical and sexual abuse: Comparisons based on sexual identities

This study integrates the results of quantitative and qualitative methods to elucidate the association between sexual identity and physical and sexual abuse among Puerto Rican drug users. A structured questionnaire was administered to 800 subjects in New York and 399 in Puerto Rico. A total of 93 subjects (7.9%) self‐identified as homosexual or bisexual. Gay males were significantly more likely than heterosexual males to report first occurrence of physical abuse by a family member in childhood. Both gay and bisexual males were more likely than their heterosexual counterparts to report first experiencing unwanted sex in childhood and intimate partner physical abuse later in life. Lesbians were more likely than female heterosexuals to report unwanted sex in childhood. Qualitative data were collected through in‐depth life histories with 21 subjects and suggest that gay and lesbian subjects perceive antihomosexual prejudice on the part of family members as one cause of childhood physical and sexual abuse.     

Prevalence of same‐gender sexual behavior and HIV in a probability household survey in Mexican men

The prevalence of male same‐gender sexual behavior in Mexico City in relation to HIV transmission was studied. A household probability survey of 8,068 adult men was conducted in 1992–93 using the Mexican National Health Survey sampling frame. The response rate was 59%. Differences between respondents and nonrespondents indicated no evidence for significant bias. A random subsample of 1,116 individuals provided serum or saliva for HIV testing. An estimated 2.5% of men practiced same‐gender sex in their lifetime: 2.1% (95% CI: 1.7 ‐ 2.4%) reported bisexual behavior and 0.4% (95% CI: 0.3 ‐ 0.6%) reported exclusively homosexual behavior. Among bisexuals, 70% reported sex only with women in the previous year, 7% reported sex only with men, 13% reported sex with both, and 10% were sexually inactive. A condom was used by 46% in their last homosexual encounter. An estimated 0.1% of married men were homosexually active in the previous year. The HTV prevalence estimate was 0.2% in the sample. The rate was 4% among homosexual/bisexual men and 0.09% in heterosexual men (p < 0.0001). Estimates of homosexual behavior and HTV infection from this population‐based sample are lower than results from nonprobability studies. The low prevalence of condom use anticipates future growth of the epidemic in the homosexual population. Bisexual behavior appeared to be infrequent and transitory, particularly among married men.     

The effect of stimulus content on volunteering for sexual interest research among college students

Much of the literature on volunteer bias in sexual interest research has been limited to either identifying variables on which volunteers differ from nonvolunteers or examining how the intrusiveness of the measurement device affects volunteer rates. The present study was designed to examine whether stimulus content would affect volunteer rates and volunteer/nonvolunteer differences in a large sample of college students (206 men and 358 women). The study also sought to determine whether such findings could also apply to research that recruits from exclusively heterosexual samples. Students completed questionnaires in small groups and were asked whether they would be willing to volunteer for studies that would involve viewing and rating five different types of sexually explicit images (nude men, nude women, heterosexual behavior, male homosexual behavior, and female homosexual behavior). Results indicate that men and women differed in the types of images that they would volunteer to view, based upon the content of the images. Furthermore, volunteers for each type of image reported significantly greater self-monitoring as well as sexual and general sensation seeking than did nonvolunteers, while differences on other measures were less consistent. Discussion is given to specific ways in which the findings and generalizability of sexual interest study results can be affected.     

Nonconscious processing of sexual information: A generalization to women

Sexually competent stimuli may nonconsciously activate sexual memory and set up sexual responding. In men, subliminally presented sexual pictures facilitated recognition of sexual information (Spiering, Everaerd, & Janssen, 2003). The goal of the two experiments reported here was to investigate to what extent this result can be generalized to women. A direct replication in women failed in Experiment 1. In Experiment 2, besides the male‐oriented sexual picture set, pictures of two other sets were presented: female‐oriented sexual pictures and baby pictures. Effects of the menstrual cycle were also examined. In Experiment 2, only male‐oriented pictures showed a facilitation effect. Sensitivity for reproductive stimuli was enhanced during the midluteal phase. Like men, women may nonconsciously recognize a stimulus as sexual. This recognition process seems unrelated to the potential of the stimulus to elicit subjective arousal.     

Investigating the Task Dependency of Viewing Time Effects

The viewing time method (VT) is an indirect measure of sexual interest in which participants are usually asked to rate the sexual attractiveness of target stimuli while their response latencies are unobtrusively measured. Higher response latencies for a certain group of depicted individuals indicate sexual interest in that group. Contrary to the general assumption that the picture content accounts for this effect by eliciting affect- or attention-based response delays, we hypothesized that the attractiveness rating task might be responsible for the VT effect. To test this hypothesis, we used two different tasks. Our heterosexual and homosexual male participants (N = 50) were instructed to rate the attractiveness or the sex of the depicted individuals. As expected, VT effects only emerged in attractiveness rating trials. Based on these findings, we conclude that VT effects are task dependent and are unlikely to be caused by affective or attentional processes (at least when participants are instructed to rate the attractiveness of target stimuli). We argue that rating tasks in VT measures cause participants to use affect independent response strategies. These response strategies seem to undermine stimulus-driven processes (like increased attention directed toward salient stimuli) which were thought to cause VT effects according to previous hypotheses.     

Effect of Sexual Arousal on Cortical Coupling During Performance of the Tower of Hanoi Task in Young Men

Sexual arousal affects cognitive processing, which depends on the coordinated functioning among cortical areas. The aim of this research was to determine whether previous observation of videos with sexual content affects the degree of cortical electroencephalographic (EEG) coupling during performance of an executive task. Cortical EEG correlations were calculated in three groups of heterosexual men under three conditions: at rest; during observation of a video with neutral, aggressive, or erotic content; and while performing the Tower of Hanoi task (TOH). Based on self-reports, it was shown that the erotic video induced general and sexual arousal, while the aggressive video affected valence and general arousal. Task performance was similar in all three groups. During performance of TOH, only the erotic group showed a decreased correlation between prefrontal areas with an increased correlation between parietal and prefrontotemporal areas, specifically in the slow bands. It is likely that these changes in the degree of cortical coupling could be associated with the cognitive strategies or functional adaptations that participants require to adequately solve the task during a state of sexual arousal. These data could contribute to improving our understanding of the central nervous mechanisms that underlie the effect of sexual arousal on the cognitive processes involved in tasks like TOH.     

Observational Stance as a Predictor of Subjective and Genital Sexual Arousal in Men and Women

Observational stance refers to the perspective a person takes while viewing a sexual stimulus, either as a passive observer (observer stance) or an active participant (participant stance). The objective of the current study was to examine the relationship between observational stance and sexual arousal (subjective and genital) across a range of sexual stimuli that do or do not correspond with a participant's sexual attraction (preferred or nonpreferred stimuli, respectively). Regression analyses revealed that, for men (n = 44), participant stance significantly predicted subjective and genital arousal. Women's (n = 47) observer and participant stance predicted subjective arousal but not genital arousal. Analysis of variance showed that participant stance was greatest under preferred sexual stimuli conditions for all groups of participants, while observer stance scores revealed a less consistent pattern of response. This was particularly true for opposite-sex-attracted women, whose ratings of observer stance were lowest for preferred stimuli. Observational stance does not appear to account for gender differences in specificity of sexual arousal; for men, however, participant stance uniquely predicted genital response after controlling for sexual attractions. Similarities in the relationships between men's and women's observational stance and sexual responses challenge previous claims of gender differences in how men and women view erotica.     

The effects of target attractiveness on men's sexual arousal in response to erotic auditory stimuli

Previous research on sexual arousal resulting from auditory stimuli indicates that visual imagery acts as a mediator between stimulus input and resulting arousal. This leads to the question of whether imagery, and subsequent arousal, can be manipulated by providing differing information to hold in semantic memory. This research hypothesizes that attractive images held within semantic memory and pattern-matched with an erotic auditory stimulus facilitate higher self-reported arousal, and at a more rapid rate, than unattractive images. Participants in an "Unattractive" condition experienced slower rates and lower mean levels of arousal in response to an auditory stimulus, compared to participants in an "Attractive" or "No Picture" condition. No differences existed between groups in maximum arousal scores or the tendency to visualize the target during the listening task. Implications for the role of imagery in sexual response, possible measurement issues, and suggestions for future research are addressed in the discussion.     

The Effects of Target Attractiveness on Men's Sexual Arousal in Response to Erotic Auditory Stimuli

Previous research on sexual arousal resulting from auditory stimuli indicates that visual imagery acts as a mediator between stimulus input and resulting arousal. This leads to the question of whether imagery, and subsequent arousal, can be manipulated by providing differing information to hold in semantic memory. This research hypothesizes that attractive images, held within semantic memory and pattern matched with an erotic auditory stimulus, facilitate higher and more rapid self-reported arousal than do unattractive images. Participants in an unattractive condition experienced slower rates and lower mean levels of arousal in response to an auditory stimulus compared with participants in an attractive or no picture condition. No differences existed between groups in maximum arousal scores or the tendency to visualize the target during the listening task. Implications for the role of imagery in sexual response, possible measurement issues, and suggestions for future research are addressed in the discussion.     

Epidemiology of provoked abortion in Santiago,Chile

An exploratory study was conducted to examine the level of success of heterosexual and homosexual couples in their “permanent” pairing relationships. Subjects completed seven self‐report measures of various aspects of their relationships. All couples showed high levels of success; however, homosexual couples had significantly lower levels compared to married couples. Homosexual females had significantly lower scores on self‐esteem and generalized contentment, suggesting that being lesbian and a woman may be a twofold problem. Some evidence of cross gender sex‐role endorsement occurred in all three groups but not in homosexual subjects exclusively as is the societal expectation.     

On becoming a prostitute: An exploratory case‐comparison study

We examined the effects of sexual arousal on cortical somatosensory evoked potentials (SEPs) elicited by electrical stimulation delivered to the skin over either the dorsal penile or posterior tibial nerve. The electrical stimuli were initiated by the subject pressing a button. In Experiment 1, a single stimulus was delivered immediately upon button press. In Experiment 2, a randomly spaced train of stimuli was delivered after a randomly varying delay. SEPs were obtained during (1) a baseline condition during which subjects viewed a non‐erotic videotape, (2) an arousal condition in which subjects viewed an erotic videotape, and (3) a post‐orgasm condition during which subjects again viewed the non‐erotic videotape. Amplitudes of SEP components elicited by stimulation of either nerve decreased with sexual arousal and tended to return towards baseline values in the post‐orgasm condition. The SEP components that showed these changes included slow potentials generated before and after stimulus delivery, as well as the vertex potentials, N100 and P200.