Heterosexual sex video samples-Sexual Arousal Patterns of Identical Twins with Discordant Sexual Orientations | Scientific Reports

Vaginal photoplethysmography is a method for physiological evaluation of sexual arousal in women. This paper undertook to obtain the validity and reliability of a set of sexual stimuli in young heterosexual women. Six six-minute video clips were selected. Objective Sexual Arousal, Subjective Sexual Arousal, emotional activation, emotional valence and socio-psycho-sexual information were evaluated. Three of the six sexual stimuli were selected from the scores obtained after the experimental phase.

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Vaginal photoplethysmography is a method for physiological evaluation of sexual arousal in women. This paper undertook to obtain the validity and reliability of a set of sexual stimuli in young heterosexual women.

Six six-minute video clips were selected. Objective Sexual Arousal, Subjective Sexual Arousal, emotional activation, emotional valence and socio-psycho-sexual information were evaluated. Three of the six sexual stimuli were selected from the scores obtained after the experimental phase. It was observed that the aforementioned video clips produced the most arousal-activation-pleasure, with internally consistent measures.

As expected, good indicators of external validity were observed, with statistically significant differences. According to the data obtained, the pooled use of the three stimuli increases the likelihood of obtaining an objective arousal response in healthy young women, thereby minimizing the possibilities of displeasure.. According to the sexual response model proposed by Masters and Johnson , changes in vaginal vasoconstriction and lubrication are two physiological reactions that correlate with sexual arousal in women.

In addition, these reactions allow the body to become prepared for sexual activity Levin, , Geer in The vaginal photoplethysmograph is a tampon-shaped plastic device made of transparent acrylic material 4. The acrylic probe contains a red light which is reflected toward the ventral wall of the vagina; thus, only the fraction of the tissue radiated is the part where the recording of reflected light is obtained by a photosensitive cell.

Changes in the magnitude of the light reflect changes in vaginal blood flow Hatch, The vaginal photoplethysmograph has been used in several studies involving female sexuality, seeking to identify variables that may affect sexual arousal. Research in this field accounts for the importance of internal and external aspects to achieve adequate sexual arousal; hence the availability of tools — like a set of sexual stimuli — to facilitate a reliable and valid evaluation in women.

Marshall reported the absence of standardized stimuli as an aspect to improve research on the subject. Thus, diversity in stimuli makes validation — and particularly the study of sexual arousal in women — a difficult task.. Several limitations in the standardization of stimuli or methodologies were pointed out by Howes and Marshall, Serran, and Yates No solution has been found for these restrictions as yet. According to Marshall , these limitations remain latent in the field of research. Thus, there emerge a number of methodological items Carvalho et al.

Kukkonen indicates that research in the field of female sexual evaluation would benefit by having an updated, reliable and valid set of stimuli. However, the stimuli used for VPP to date have little psychometric support Marshall, Therefore, the objective of this experiment-based instrumental study is to obtain the validity and reliability of a set of sexual stimuli for heterosexual women..

The sample consisted of 34 Colombian women. The following inclusion criteria were established: being over 18 and being exclusively or mainly heterosexual. All participants reported no sexual problems of any kind.

The sample was divided into three groups To ensure that sexual stimuli remained balanced between the three groups of participants group A — with 12 participants — was exposed to sexual stimuli SS1, SS2 and SS3; group B — with 11 participants — was exposed to stimuli SS4, SS5 and SS6; and group C — consisting of 11 participants — was exposed to the three finally selected stimuli..

The participants were shown six videos with sexual content and three videos with neutral content, each with a duration of 6 min. The sequences of presentation of SS for each group were balanced, in such a manner that each of the sexual excerpts was presented the same number of times, in each of the positions. Information regarding the selection and editing of the videos can be found in the procedure.. The participants were instructed in the use of the photoplethysmograph by way of a replica model of a vagina, in order to ensure the understanding of instructions through modeling and shaping.

Thus, the participants would be able to place the photoplethysmograph correctly and independently. Each instrument was properly disinfected under national and international standards of asepsis and antisepsis.. A semi-structured interview was used which evaluated sex, age, schooling level and city of residence, among other elements. This is a pictorial scale in which the emotional reaction that people have to the stimuli is evaluated. The SAM is answered on a 9-point visual analog scale.

High scores were indicative of a high degree of activation and pleasure, respectively.. In this research, we used the sexual arousal and genital sensations dimensions together ruling out the affective-sexual arousal dimension. Thus, a total of six items were used to evaluate Subjective Sexual Arousal..

The selection of sexual stimuli was carried out at various stages:. In addition, the recommendations suggested by Laan, Everaerd, Van Bellen and Gerrit Hanewald and Laan and Both were taken into account when choosing the videos, as follows: a the sexual contact should be initiated and controlled by the woman; b the sexual interaction should focus on her pleasure; c before starting the sexually explicit content, there should be a context of emotional development between the actors; d genital targeting is used, but more emphasis is placed on the romantic relationship between the actors; e verbal, facial and body expressions of the actors should be natural.

Furthermore, variability was sought in regards to the characteristics of the videos in order to increase the likelihood that women would be exposed both to positive and negative emotional reactions. The second phase consisted in choosing the six best videos. To this effect, four women evaluators who reported being at least mainly heterosexual rated subjectively all of the videos on a scale of one to ten, according to the following criteria: level of sexual arousal, time to reach arousal, level of sexual pleasure, pleasure with the appearance of the actors, pleasure with the situation or context, desire to participate, interest caused by the video and comfort level.

The six videos with the highest scores were chosen for the study.. The clips should contain the scenes in the following order: 1 min of scenes with non-genital erotic content — with emotional involvement — 1 min of cunnilingus, 1 min of fellatio and 3 min of vaginal penetration. The first minute of emotional involvement was included because according to Janssen, Carpenter, and Graham relating to the narrative structure storyline or the interaction between the actors might be important in predicting sexual arousal in women.

The length of the stimuli were chosen having into account that 5 or 6 min is usually the time required to generate sexual arousal in women e. Gerritsen et al. These videos portrayed images of plants, flowers and rivers, accompanied by relaxing sounds.

These videos were presented at the beginning of the sequence and between each sexual stimulus. The presentation of the NS after the end of each SS was intended to normalize the physiological response produced by the presentation of the sex videos.. The SS were assigned to the first two groups of participants, in accordance with the score they obtained in the preliminary evaluation.

Both groups watched the same NS.. Each participant watched a total of six stimuli three SS and three NS in a previously established sequential order i. All sequences were previously balanced so that all SS would have the same opportunity of being watched the same number of times at each position. The items appeared on the monitor, after the presentation of each of the SS and NS. Firstly, the analysis of physiological data entailed filtering any signal obtained from each participant's OSA to 1.

Secondly, it was necessary to obtain the amplitude of each vaginal pulse i. After this, we proceeded to calculate VPA averages of the baseline, the NS and the SS, as well as their respective standard deviation per participant.

Means and standard deviations of each total SS were obtained and comparisons were made.. Each of the participants was scheduled for an appointment at the laboratory, considering their available schedules, so as to not interfere with their daily activities.

The equipment was thoroughly prepared before the arrival of the participants, and the vaginal photoplethysmograph was placed in the experimental room.. Before starting with the experimental session, the participants were shown around the laboratory. The SexLab KL consists of two rooms; a control room with computers that record the information of the measurements taken in the session.

The second room is the experimental room, and features a desk with a monitor to present stimuli and scales, a comfortable chair and the vaginal photoplethysmograph. The rooms are separated by a door which can be manipulated only by the participant upon the beginning of the session; there are have appropriate — both natural and artificial — lighting conditions, and the room is isolated from any external noise that could potentially hamper the session.

Communication between the two rooms was performed using an intercom located in the experimental area and a microphone in the control area.. When the participants entered the control room, they were informed as to the purpose of the study. In addition, the participants were explained the procedure and were asked to sign an informed consent whereby their intention to participate and continue in the study is expressed. Once in the experimental room, the participants were given an explanation as to the correct way to place and remove the vaginal photoplethysmograph with a silicone replica of a vagina..

The experiment began when the participant claimed to be prepared. A period of 3 min was used in order to set the baseline. Subsequently, the participant was instructed to launch the task.

At the end, the researchers provided feedback to each participant; it must be mentioned that no advice or clinical diagnosis were given. All the participants who were exposed to three stimuli did not have any sexual problems..

The first instruction was to watch the video clips; the second instruction was to answer the questions that appeared at the end of the videos.. All protocols for disinfection and cleaning of equipment and instruments used were followed in pursuance of local, national and international standards of health institutions. After the evaluation of each of the participants, a high-level disinfection procedure was conducted on the vaginal photoplethysmograph.. The informed consent was kept throughout the study, respecting the privacy of the participants.

Each participant was given a copy of the consent, after information was provided on the objectives and procedure. In addition, the participants were explained the procedure and any doubts were addressed; pursuant to the principle of autonomy, the participants were asked about their interest to continue to participate and sign the consent. The participants were also informed about the possibility to withdraw at any time they wished without any repercussions whatsoever.. The first 60 s of — non-genital — erotic content of each SS were used for each participant to evaluate the possibility of withdrawing from the study, on account of the fact that the audiovisual material could cause discomfort in the participants.

Table 1 shows the results of the four variables for the six SS. A ranking was created see Table 2 to select the SS that generate the highest levels of arousal-activation-pleasure by comparing the measurements obtained from groups A and B. All variables had the same weight when preparing the ranking. The videos that obtained the highest score in a variable were assigned six points; five points to the next, and so on.

Stimuli 1, 2 and 3 generated the most arousal-activation-pleasure, and consequently were presented to subsample C.. Descriptives for sexual stimuli.. Final ranking in accordance with the variables taken into account.. Note: SS are sexual stimuli. Upon identification of the three best SS, their validity and reliability were evaluated with a total of 23 data entries from the participants of group A and C.

Table 3 shows the differences between the means for each variable stimulus i. Reliability of the SS obtained was calculated using Cronbach's alphas. Thus, stimuli obtained an alpha of 0. Accurate evaluation and the use of validated instruments or tools is key insofar as there is a potential impact on clinical, legal or research-related decisions — in this case, the welfare of women.

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