Sexual Interaction System Scale

Abstract

The Sexual Interaction System Scale (SISS) is a multidimensional, dyadic psychometric assessment instrument developed by Jane D. Woody and Henry J. D’Souza in 1994 to evaluate the systemic, interactional quality of intimate heterosexual sexual encounters. Unlike traditional individual-oriented sexological inventories that assess physiological dysfunctions as isolated intrapsychic or biomedical deficits, the SISS evaluates sexual dynamics through a comprehensive systems theory lens. It conceptualizes dyadic sexual exchange as an ongoing, reciprocal cybernetic feedback loop where somatic, emotional, cognitive, and interpersonal behaviors operate as communicative transactions. The instrument comprises 48 self-report items administered independently to both partners, who evaluate their shared sexual experiences with reference to their most recent two to three sexual encounters. Responses are recorded on a 6-point anchored Likert-type scale ranging from 0 (none, never, does not occur in our relationship) to 5 (high, always, always occurs in our relationship).

The scale measures five systemic factors: Sexual Functioning (encompassing Diagnostic and Statistical Manual of Mental Disorders criteria across desire, arousal, orgasm, and sexual pain), Attitudinal Set (evaluating maturity, performance anxiety, and self- versus couple-focus), Nonsexual Interaction (capturing broader relationship patterns including territoriality, dominance ranking, attachment security, and tactile exploration), Interaction Coordination (assessing verbal and nonverbal behavioral navigation and cue exchange), and Postsexual Interaction (measuring affective tenor, intimacy resolution, and bonding or alienation following intercourse). Individual total scores range from 0 to 225, with maximum factor ceilings of 50, 35, 60, 30, and 50 points, respectively. By summing both partners’ individual totals, a global couple score is derived. Psychometric evaluations demonstrate robust internal consistency, notable criterion validity with sexual satisfaction measures (r = .80, p < .001), significant discriminant validity differentiating clinical sexual dysfunction couples from nonclinical controls (t = 7.14, p < .001), and meaningful convergence with the Dyadic Adjustment Scale (r = .61, p < .001). The SISS provides sex therapists, clinical psychologists, and marital researchers with an empirically validated diagnostic and treatment-planning instrument.

Keywords

Sexual Interaction System Scale, SISS, sexual dysfunction, couples therapy, systems theory, sexual communication, dyadic assessment, marital distress, sexology, marital satisfaction

Authors

The Sexual Interaction System Scale was created and validated by Jane D. Woody, Ph.D., MSW, and Henry J. D’Souza, Ph.D.

• Jane D. Woody, Ph.D., MSW: Professor Emerita at the School of Social Work, University of Nebraska at Omaha. Dr. Woody is a prominent clinician and scholar in family therapy, marital counseling, integrative systemic therapy, and clinical sexology. She is the author of foundational works such as Treatment for Sexual Distress: Integrative Systems Therapy (1992). Contact: School of Social Work, University of Nebraska at Omaha, Omaha, NE 68182-0293; Email: [email protected].
• Henry J. D’Souza, Ph.D.: Faculty member and research methodologist at the School of Social Work, University of Nebraska at Omaha, specializing in quantitative social work research, psychometric validation, and relational assessment methodologies.

Purpose

The primary purpose of the Sexual Interaction System Scale is to address a critical theoretical and methodological gap in sexology and relationship therapy: the over-pathologization of sexual dysfunction as an isolated individual impairment rather than a recursive, dyadic interpersonal dynamic. Historically, clinical assessments treated sexual disorders—such as erectile dysfunction, premature ejaculation, hypoactive sexual desire, and female orgasmic disorder—as closed biological or intrapsychic phenomena located within a single patient. In contrast, the SISS was developed to assess how individual physiological responses, cognitive-emotional stances, nonsexual relational struggles, communicative synchrony, and post-encounter emotional experiences continuously transact within a couple’s ecological sexual system.

In clinical practice, the SISS serves as both a diagnostic mapping tool and an intervention blueprint. Couple therapists, marriage and family therapists (AAMFT), and certified sex therapists utilize the instrument to identify precisely where the sexual encounter breaks down. Because both partners complete the instrument independently, clinicians can analyze score discrepancies to uncover perceptual incongruence, asymmetrical communication, concealed performance anxiety, or latent relationship hostility disguised as sexual disinterest. The instrument determines whether a sexual complaint stems primarily from organic/functional deficits, communicative misalignment, pervasive marital distress, or unresolved territorial and dominance dynamics transferred into the bedroom.

In research settings, the SISS facilitates empirical investigations into the mechanisms of dyadic sexual health, couple communication, and treatment efficacy. It provides an empirical foundation for outcome studies comparing integrative systemic sex therapy against pharmacotherapy, cognitive-behavioral sex therapy, or standard behavioral sensate focus exercises. Furthermore, the tool is widely applicable in couple enrichment, premarital education, and marital preventative interventions, helping partners identify systemic vulnerabilities prior to the ossification of rigid, dysfunctional behavioral loops.

Psychological Construct

The psychological construct evaluated by the SISS is the systemic quality of dyadic sexual interaction. Rather than assessing sexuality as an isolated physiological reflex or a generalized subjective satisfaction score, the SISS operationalizes sexual interaction as a multi-stage cybernetic process composed of five interdependent dimensions:

1. Sexual Functioning

This dimension operationalizes the phases of the human sexual response cycle as articulated in the Diagnostic and Statistical Manual of Mental Disorders (DSM-III-R). It examines four primary subfactors: desire, physiological arousal/excitement, orgasm/ejaculation, and, for female respondents, dyspareunia or vaginismus (genital pain disorders). Crucially, the SISS conceptualizes these physiological milestones not merely as somatic markers, but as communicative transmissions. An erection, vaginal lubrication, involuntary muscular tension, or involuntary physiological withdrawal are communicative signals to which the partner immediately and reciprocally reacts with their own neurobiological and emotional processes.

2. Attitudinal Set

The Attitudinal Set dimension measures each partner’s internal cognitive framework, performance scripts, and developmental maturity regarding sexual intimacy. It differentiates between three developmental stages of sexual attitudes: self-focused (narcissistic gratification or self-conscious anxiety regarding adequacy and performance success), role-focused (adherence to rigid, stereotyped gender expectations or moralistic obligations), and individual-connected (mature relational intimacy characterized by mutual respect, authentic vulnerability, and emotional reciprocity). High scores reflect an adaptive, connected attitudinal posture free from paralyzing performance evaluation.

3. Nonsexual Interaction

Rooted in interpersonal ethology and structural family systems, this dimension assesses how nonsexual relationship themes penetrate and shape the sexual encounter. It evaluates four fundamental interpersonal behavioral systems: territoriality (bodily boundaries, autonomy, and personal space), ranking (power, dominance, submission, and decision-making authority), attachment (emotional safety, fear of abandonment, and dependency), and exploratory/sensory patterns (curiosity, playfulness, and tactile receptivity). Chronic conflicts regarding domestic control or emotional distance frequently manifest as bodily intrusion or somatic resistance during intercourse.

4. Interaction Coordination

Interaction Coordination evaluates the explicit and implicit “action language” couples employ to steer, adjust, and calibrate the sexual encounter toward mutual arousal and satisfaction. This includes verbal instruction, nonverbal signaling, physical pacing, tactile adjustments, and real-time responsiveness to a partner’s pleasure or discomfort. Couples with deficient interaction coordination frequently suffer from misread cues, premature termination of foreplay, and uncommunicated frustration.

5. Postsexual Interaction

The final dimension evaluates the emotional tenor and relational aftermath immediately following sexual contact. It measures whether the resolution phase fosters emotional bonding, intimacy, and shared warmth, or instead triggers psychological withdrawal, alienation, resentment, and physical separation. In systems theory, the postsexual phase functions as the bridge to the subsequent sexual encounter; feelings of rejection or vulnerability left unresolved during the refractory period feed directly into anticipatory avoidance or performance anxiety during future sexual invitations.

Theoretical Framework

The theoretical framework of the SISS represents an integration of General Systems Theory (von Bertalanffy, 1968), the cybernetic model of human communication (Watzlawick et al., 1967), and the interactional sexology models pioneered by Verhulst and Heiman (1979) and Schnarch (1991).

Traditional sex therapy, established by Masters and Johnson (1970) and Helen Singer Kaplan (1974), made significant strides by demystifying the human sexual response cycle and introducing targeted behavioral interventions like sensate focus. However, systemic theorists observed that these approaches frequently treated couples as two juxtaposed monads rather than a holistic ecological unit. Verhulst and Heiman (1979) challenged this individualistic paradigm by conceptualizing sexual interaction as an ongoing communication network. Within this framework, every sexual behavior constitutes an informational exchange that carries both report (content) and command (relational definition) aspects.

Woody (1992) synthesized these principles into Integrative Systems Therapy for Sexual Distress, which provides the direct theoretical architecture for the SISS. The foundational tenets of this framework include:

• Circularity vs. Linear Causality: Sexual problems do not arise from a single partner’s pathology (e.g., “Partner A has low desire, causing Partner B to become frustrated”). Instead, they operate within circular feedback loops: Partner B’s intrusive demands may activate Partner A’s territorial boundaries, resulting in somatic withdrawal, which Partner B interprets as abandonment, triggering further demanding behavior.
• Somatic Communication: The body is an active communicative organ. Genital non-responsiveness, loss of erection, or lack of lubrication are often physiological expressions of relational discord, systemic over-functioning/under-functioning, or boundary violations rather than isolated endocrinological failures.
• Isomorphism: The patterns exhibited during a sexual encounter are structurally isomorphic to the couple’s broader systemic functioning. Issues of power, intimacy, autonomy, and vulnerability present in daily domestic life are inevitably enacted during physical intimacy.

Validity

The psychometric validity of the Sexual Interaction System Scale was systematically established across content, known-groups construct, and criterion-related dimensions by Woody and D’Souza (1994):

• Content and Face Validity: Initial item generation was grounded in extensive clinical casework and theoretical models of interactional sexology. The proposed items were submitted to a panel of six independent clinical and academic experts in sex and marital therapy. The panel evaluated each item for theoretical congruence, clinical clarity, and domain representativeness, resulting in refined phrasing and the final 48-item scale structure.
• Known-Groups Construct Validity: The scale’s construct validity was tested by administering the instrument to a sample of 143 couples classified into distinct clinical and nonclinical cohorts. Independent-samples t-tests revealed that the SISS decisively differentiated between couples seeking treatment for diagnosed sexual dysfunctions and nonclinical control couples (t = 7.14, p < .001). Furthermore, the scale differentiated couples suffering from formal sexual dysfunctions from couples presenting with generalized relationship conflict devoid of primary sexual dysfunction (t = 2.05, p < .05), confirming that the SISS does not merely measure non-specific marital unhappiness, but captures unique sexual-systemic pathology.
• Criterion-Related and Concurrent Validity: Concurrent validity was demonstrated by correlating the SISS couple total score against an independent global criterion measure of sexual satisfaction, yielding a substantial correlation coefficient of r = .80 (p < .001).
• Convergent and Discriminant Relational Validity: To assess the scale’s relationship to overarching dyadic functioning, the authors administered the widely validated Dyadic Adjustment Scale (DAS). The SISS couple score demonstrated a robust, statistically significant moderate-to-high correlation with the DAS (r = .61, p < .001). This confirms that while sexual interaction systems are deeply intertwined with general marital adjustment, the SISS preserves distinct variance specifically attributable to physical intimacy dynamics.

Reliability

The reliability of the SISS was rigorously evaluated by Woody and D’Souza (1994) using a validation cohort of 143 heterosexual couples (N = 286 individuals). Internal consistency was examined across the five systemic factors using Cronbach’s alpha coefficients:

• Factor Internal Consistency: In their foundational study, Woody and D’Souza demonstrated strong internal consistency across the subscales, supporting the systemic premise that items within each factor measure coherent, unified dimensions of dyadic functioning. High inter-item correlations were observed across the domains, reflecting both item homogeneity and theoretical fidelity.
• Structural Inter-Factor Correlations: In alignment with cybernetic systems theory, the five subfactors are moderately to highly intercorrelated, reflecting the fact that sexual response, cognitive attitudes, general relational dynamics, coordination, and post-coital states operate as mutually reinforcing systemic loops rather than independent, orthogonal constructs.
• Measurement Precision and Scoring Stability: Standardized profile comparisons between the Nonclinical sample (N = 58 couples) and the Sexual Dysfunction clinical sample (Males N = 20, Females N = 24) demonstrated narrow standard errors of measurement (SEM), indicating stable and dependable score estimations across both male and female partners.

Factor Analysis

The structural dimensionality of the 48-item SISS was developed through theoretical deduction combined with exploratory factor analysis (EFA). The initial structural hypothesis posited that sexual interactions could not be modeled unidimensionally, but instead required a five-factor interactional matrix reflecting the sequential and concurrent stages of an intimate encounter:

• Factor 1: Sexual Functioning (10 items): Encompasses items measuring the physiological markers of sexual desire, excitement/lubrication/erection, orgasmic release, and coital discomfort. Factor loadings for functional competence items loaded positively, while items assessing dysfunctions loaded inversely onto this primary physical axis.
• Factor 2: Attitudinal Set (7 items): Captured variance regarding cognitive anxiety, preoccupation with erotic success, performance pressure, and maturity of relational investment. Loadings confirmed that self-preoccupation and fear of failure clustered distinctively away from physiological parameters.
• Factor 3: Nonsexual Interaction (12 items): Formed the largest single component of the inventory, aggregating items that evaluate interpersonal boundary struggles, tactile possessiveness, dominance struggles, and emotional distance enacted in the bedroom.
• Factor 4: Interaction Coordination (6 items): Loaded items specifically reflecting real-time communication, nonverbal guiding, verbal requests, and collaborative attunement during erotic play.
• Factor 5: Postsexual Interaction (10 items): Isolated items measuring psychological integration, closeness, cuddles, tenderness, or conversely, emotional abandonment, rapid withdrawal, and alienation following orgasm or termination of intercourse.

Goodness-of-fit and factor separation supported the five-factor solution over single-factor or two-factor models, proving that dyadic sexual interaction requires an integrative multi-tiered assessment approach.

Instrument / Measurement Tool

The operational administration and technical characteristics of the Sexual Interaction System Scale are structured as follows:

• Tool Name: Sexual Interaction System Scale (SISS)
• Authors: Jane D. Woody and Henry J. D’Souza (1994)
• Administration Format: Self-report paper-and-pencil inventory or computerized interactive clinical assessment.
• Target Population: Adult heterosexual couples engaged in committed or regular sexual relationships; applicable to couples presenting with sexual dysfunctions, general marital dissatisfaction, or those participating in premarital counseling and relationship enrichment.
• Item Count: 48 items distributed across five subscales:
  • Sexual Functioning: 10 items
  • Attitudinal Set: 7 items
  • Nonsexual Interaction: 12 items
  • Interaction Coordination: 6 items
  • Postsexual Interaction: 10 items
• Response Format: 6-point anchored Likert scale:
  • 0: None or never on the characteristic described / Does not occur in our relationship
  • 1: Rarely on the characteristic described
  • 2: Occasionally on the characteristic described
  • 3: Moderately on the characteristic described
  • 4: Frequently on the characteristic described
  • 5: Extremely high or always on the characteristic described / Always occurs in our relationship
• Administration Time: Approximately 10 to 15 minutes per partner.
• Administration Protocol: Partners must complete the questionnaire independently without consulting one another, preferably on the same day, focusing on the common frame of reference of their last two or three sexual encounters.
• Scoring and Transformation:
  • Specific dysfunctional or negative items are reversed in value prior to factor aggregation as indicated on the scoring sheets.
  • Subscale Maximum Scores: Sexual Functioning = 50; Attitudinal Set = 35; Nonsexual Interaction = 60; Interaction Coordination = 30; Postsexual Interaction = 50.
  • Individual Total Score: Sum of all five factors, ranging from 0 to 225. Higher scores indicate healthier, more communicative, and mutually satisfying sexual interaction.
  • Couple Total Score: Sum of both partners’ individual total scores (range 0 to 450).
  • Clinical Profiling: Raw scores are plotted onto Male and Female Profile Sheets standardized with T-scores (Mean = 50, SD = 10) based on nonclinical normative samples (N = 58 couples). Clinically significant cut-off thresholds are designated based on the mean profiles of clinically diagnosed sexual dysfunction cohorts (Males N = 20, Females N = 24).

Permissions & Fee and Test Year

The Sexual Interaction System Scale was formally published in 1994 in the Journal of Sex & Marital Therapy. The instrument and its accompanying scoring matrices and clinical profile sheets are protected by copyright held by Jane D. Woody and Henry J. D’Souza. The authors have historically made the instrument accessible for academic research, education, and clinical practice upon direct request.

Clinicians and researchers wishing to utilize the complete 48-item SISS, scoring protocols, or male/female profile norm sheets must contact the primary author to obtain authorized permission and copies:

Jane D. Woody, Ph.D., MSW
School of Social Work, University of Nebraska at Omaha
Omaha, NE 68182-0293, USA
Email: [email protected]

References

• American Psychiatric Association. (1987). Diagnostic and statistical manual of mental disorders (3rd ed., rev.). American Psychiatric Association. https://doi.org/10.1176/appi.books.9780890420188
• Kaplan, H. S. (1974). The new sex therapy: Active treatment of sexual dysfunctions. Brunner/Mazel.
• Masters, W. H., & Johnson, V. E. (1970). Human sexual inadequacy. Little, Brown and Company.
• Schnarch, D. M. (1991). Constructing the sexual crucible: An integration of sexual and marital therapy. W. W. Norton & Company.
• Spanier, G. B. (1976). Measuring dyadic adjustment: New scales for assessing the quality of marriage and similar dyads. Journal of Marriage and the Family, 38(1), 15–28. https://doi.org/10.2307/350547
• Verhulst, J., & Heiman, J. (1979). An interactional approach to sexual dysfunction. American Journal of Family Therapy, 7(4), 19–36. https://doi.org/10.1080/01926187908250335
• von Bertalanffy, L. (1968). General system theory: Foundations, development, applications. George Braziller.
• Watzlawick, P., Beavin, J. H., & Jackson, D. D. (1967). Pragmatics of human communication: A study of interactional patterns, pathologies, and paradoxes. W. W. Norton & Company.
• Woody, J. D. (1992). Treatment for sexual distress: Integrative systems therapy. SAGE Publications.
• Woody, J. D., & D’Souza, H. J. (1994). The Sexual Interaction System Scale: A new inventory for assessing sexual dysfunction and sexual distress. Journal of Sex & Marital Therapy, 20(3), 210–228. https://doi.org/10.1080/00926239408404372

13. Items of the Scale (Questionnaire)