Interpersonal Exchange Model of Sexual Satisfaction Questionnaire

Abstract

The Interpersonal Exchange Model of Sexual Satisfaction Questionnaire (IEMSS) is a theoretically grounded, multi-component psychometric battery developed by E. Sandra Byers and Kelli-an Lawrance to assess subjective sexual satisfaction and its underlying exchange mechanisms within interpersonal relationships. Rooted in social exchange theory and interdependence theory, the IEMSS addresses major conceptual and methodological weaknesses common in legacy human sexuality research, such as conflating sexual satisfaction with physiological functioning (e.g., erectile capacity or orgasmic attainment) or behavioral frequency (e.g., coital counts). The comprehensive questionnaire comprises three primary self-report instruments: the Global Measure of Sexual Satisfaction (GMSEX), the Global Measure of Relationship Satisfaction (GMREL), and the Exchanges Questionnaire, alongside an optional 58-item Rewards/Costs Checklist (RCC). The GMSEX and GMREL utilize five 7-point bipolar semantic differential items yielding total scores between 5 and 35. The Exchanges Questionnaire assesses perceived direct sexual rewards, sexual costs, comparison levels against internal expectations (CL), and perceived dyadic equality between partners on 9-point scales. These components compute explicit balance indices ($REW – CST$ and $CLREW – CLCST$) and equality scores ($EQREW$ and $EQCST$). Psychometric evaluations across diverse populations—including mixed-sex cohabiting and married couples, sexual-minority populations (lesbian, gay, and bisexual individuals), and cross-cultural cohorts—demonstrate high internal consistency ($lpha = .90 ext{–}.96$ for GMSEX; $lpha = .91 ext{–}.96$ for GMREL) and robust test-retest reliability across 2-week ($r = .84$), 3-month ($r = .78$), and 18-month ($r = .73$) intervals. Convergent and construct validity are evidenced by strong correlations with established instruments such as the Index of Sexual Satisfaction and the Dyadic Adjustment Scale, confirming the IEMSS as an indispensable instrument in clinical sexology, couples therapy, and relationship science.

Keywords

Interpersonal Exchange Model of Sexual Satisfaction, IEMSS, GMSEX, GMREL, sexual satisfaction, social exchange theory, sexual rewards, sexual costs, equity theory, relationship quality

Authors

The Interpersonal Exchange Model of Sexual Satisfaction Questionnaire was conceptualized, operationalized, and psychometrically validated through the collaborative empirical work of clinical psychologists and relationship researchers:

• Kelli-an Lawrance, Ph.D.: Professor in the Department of Health Sciences at Brock University, St. Catharines, Ontario, Canada. Dr. Lawrance specializes in behavioral health, intimate relationship processes, adolescent health decision-making, and quantitative methodologies in sex research.
• E. Sandra Byers, Ph.D., L.Psych.: Professor Emerita and former Chair of the Department of Psychology at the University of New Brunswick (UNB), Fredericton, New Brunswick, Canada. Dr. Byers is a renowned scholar in human sexuality, Fellow of the Canadian Psychological Association (CPA), and former President of the Society for the Scientific Study of Sexuality (SSSS). Her scholarship focuses on sexual communication, sexual satisfaction, relationship dynamics, sexual coercion, and sexual well-being among diverse populations.
• Jacqueline N. Cohen, Ph.D., L.Psych.: Clinical psychologist formerly affiliated with the University of New Brunswick and the Correctional Service of Canada. Dr. Cohen’s empirical contributions expanded the IEMSS framework to sexual-minority populations, investigating minority stress, dyadic resilience, and sexual functioning in women in same-sex relationships.

Purpose

The IEMSS Questionnaire was developed to solve critical operational, psychometric, and conceptual problems in clinical sexology and dyadic relationship research. Historically, sexual satisfaction was evaluated either via ad-hoc single-item indicators lacking documented reliability, or through compound scales that confounded affective sexual satisfaction with behavioral variables—such as sexual frequency, coital positions, or specific physiological dysfunctions like premature ejaculation or female orgasmic disorder. Such operational confounds produced tautological fallacies, where predictors of sexual satisfaction (e.g., frequency of intercourse or orgasm) were embedded directly within the dependent outcome measure.

The primary purpose of the IEMSS is to provide a clean, theoretically derived assessment battery that separates the subjective evaluation of a couple’s sexual relationship from the behavioral and cognitive antecedents that produce that evaluation. Designed for use in both empirical research and clinical marital and sex therapy, the IEMSS operationalizes sexual satisfaction as an overarching affective evaluation guided by four distinct interpersonal exchange dimensions:

• The absolute balance between perceived sexual rewards and sexual costs within the intimate dyad;
• The discrepancy between realized sexual rewards and costs relative to the individual’s baseline internal expectations or comparison level (CL);
• The perceived equity or equality of sexual rewards and sexual costs experienced by oneself relative to one’s intimate partner; and
• The overarching non-sexual quality and climate of the intimate relationship.

In clinical interventions, the IEMSS enables clinicians to pinpoint the exact structural source of sexual dissatisfaction. A client may experience high absolute rewards but suffer distress due to a severe perception of partner inequality, or an individual may maintain realistic expectations that buffer their satisfaction despite elevated relationship costs. In research paradigms, the IEMSS provides an explicit framework for testing longitudinal, systemic, and dyadic models of sexual satisfaction across heterosexual and LGBTQ+ partnerships.

Psychological Construct

The core construct measured by the IEMSS framework is sexual satisfaction, operationalized within this model as an individual’s affective and cognitive evaluation of the positive and negative dimensions characterizing their sexual relationship. Rather than viewing sexual satisfaction as an isolated sensory phenomenon or a direct byproduct of physical orgasm, the IEMSS conceptualizes it as an emergent property of continuous dyadic exchanges. The construct comprises several distinct, interacting dimensions:

1. Global Sexual and Relationship Satisfaction

Subjective satisfaction is quantified through the Global Measure of Sexual Satisfaction (GMSEX) and the Global Measure of Relationship Satisfaction (GMREL). These constructs represent broad, valence-driven evaluative attitudes regarding one’s sexual interactions and general relationship health, respectively. By measuring both constructs in parallel, the framework isolates sexual dynamics from overall dyadic adjustment.

2. Direct Sexual Rewards and Costs ($REW$ and $CST$)

Sexual rewards are defined as interpersonal, psychological, or physical exchanges within the sexual relationship that are pleasurable, gratifying, reinforcing, or validating. Examples include physical sensations of touching, emotional intimacy during intercourse, feelings of shared vulnerability, spontaneous sexual initiation, and verbal affirmation. Conversely, sexual costs represent experiences, behaviors, or states that require arduous effort, induce physical discomfort or pain, evoke negative affect (such as guilt, anxiety, shame, or boredom), or detract from personal autonomy. The psychological balance of these exchanges ($REW – CST$) reflects the net positive valence realized within the intimate partnership.

3. Comparison Levels for Rewards and Costs ($CLREW$ and $CLCST$)

Rooted in interdependence theory, the Comparison Level (CL) represents an internalized psychological standard or cognitive anchor regarding what an individual believes they deserve or should realistically expect from a sexual partnership. The comparison level is shaped by past sexual experiences, social comparisons, cultural messages, and internal relationship schemas. When realized rewards exceed the comparison level ($CLREW$), the individual experiences psychological gratification; when realized costs exceed expected costs ($CLCST$), substantial dissatisfaction and relational distress emerge.

4. Perceived Equality and Equity ($EQREW$ and $EQCST$)

The perceived equality dimension captures fairness and balance in the distribution of sexual benefits and burdens between partners. Psychological equity theory emphasizes that distress arises not only when an individual feels under-benefited (incurring disproportionate costs or fewer rewards relative to their partner), but also when they perceive systemic over-benefiting (which can induce guilt and relational discomfort). The IEMSS codes perfect dyadic balance as the optimal psychological state, penalizing both under-benefited and over-benefited asymmetries.

Theoretical Framework

The architectural foundation of the IEMSS rests on the synthesis of three major micro-sociological and psychological paradigms: Social Exchange Theory (Homans, 1961), Interdependence Theory (Thibaut & Kelley, 1959; Kelley & Thibaut, 1978), and Equity Theory (Walster, Walster, & Berscheid, 1978).

The Interpersonal Exchange Model of Sexual Satisfaction

Lawrance and Byers (1992, 1995) adapted social exchange formulations to human sexuality, challenging the clinical assumption that sexual satisfaction is driven primarily by individual techniques, anatomical compatibility, or physiological capacity. The theoretical framework posits four formal postulates:

1. The Net Exchange Postulate: Sexual satisfaction is positively associated with the degree to which sexual rewards outnumber and outweigh sexual costs ($REW – CST$).
2. The Comparison Level Postulate: Sexual satisfaction is positively related to the degree to which realized sexual rewards exceed internalized expectations ($CLREW$) and realized sexual costs fall below anticipated costs ($-CLCST$).
3. The Dyadic Equity Postulate: Sexual satisfaction is highest when partners perceive mutual balance and reciprocity in their exchange ratios ($EQREW$ and $EQCST$), whereas perceived relational asymmetry (whether one is advantaged or disadvantaged) diminishes affective satisfaction.
4. The Relational Context Postulate: Sexual exchanges are nested within the broader relationship; non-sexual relationship satisfaction (GMREL) forms a foundational cognitive baseline that accounts for substantial variance in sexual satisfaction.

The model is traditionally evaluated via a two-step hierarchical regression model:

$$\text{Sexual Satisfaction (GMSEX)} = \beta_0 + \beta_1(\text{GMREL}) + \beta_2(REW – CST) + \beta_3(CLREW – CLCST) + \beta_4(EQREW) + \beta_5(EQCST) + \epsilon$$

By framing sexual satisfaction within these interdependent contingencies, the IEMSS accounts for why high orgasmic frequency does not guarantee high satisfaction if costs (such as feeling coerced or emotionally distant) are elevated, or why infrequent sexual activity can still yield high satisfaction if expectations are aligned and equity is maintained.

Validity

The psychometric validity of the IEMSS battery has been established across multiple independent investigations involving dating, cohabiting, and married heterosexual couples, cross-cultural cohorts, and sexual-minority populations.

Construct and Convergent Validity

Initial validation studies by Lawrance and Byers (1992, 1995) demonstrated strong convergent validity for the GMSEX against older, established instruments. Specifically, GMSEX scores correlated strongly and inversely ($r = -.65, p < .001$) with the Index of Sexual Satisfaction (Hudson, Harrison, & Crosscup, 1981), where lower scores denote clinical absence of sexual discord. The GMREL demonstrated high convergent validity with the Dyadic Adjustment Scale (Spanier, 1976), exhibiting a correlation of $r = .69$ ($p < .001$).

Direct reward scores ($REW$) correlated negatively with sexual discord ($r = -.66, p < .001$) and positively with single-item global indicators of sexual satisfaction ($r = .64, p < .001$). Costs ($CST$) demonstrated statistically significant positive correlations with sexual discord ($r = .30, p < .01$). Later structural analyses (MacNeil & Byers, 2009; Renaud & Byers, 2001) verified that higher GMSEX scores associate systematically with open dyadic sexual communication, elevated sexual self-esteem, positive sexual cognitions, higher sexual desire, and communal relationship orientations.

Predictive and Incremental Validity

Hierarchical regression analyses confirm the incremental validity of the exchange components beyond general relationship quality. Entering GMREL at Step 1 consistently accounts for $35% ext{–}45%$ of the variance in GMSEX. Entering the four exchange indices ($REW – CST$, $CLREW – CLCST$, $EQREW$, $EQCST$) at Step 2 contributes significant incremental variance ($\Delta R^2 = .15 ext{–}.25, p < .001$), supporting the distinct contribution of the social exchange variables.

Cross-Cultural and Sexual-Minority Generalizability

Renaud, Byers, and Pan (1997) validated the model in mainland China, demonstrating that the structural pathways operate consistently in non-Western, collectivistic contexts. Cohen, Byers, and Walsh (2008) and Cohen (2008) validated the revised Rewards/Costs Checklist and the IEMSS in gay, lesbian, and bisexual populations, confirming that the four exchange components predict sexual satisfaction regardless of sexual orientation or gender composition within the dyad.

Reliability

The IEMSS demonstrates robust psychometric reliability across internal consistency and temporal stability metrics.

Internal Consistency

Both the GMSEX and GMREL display high internal consistency across clinical and non-clinical samples:

• GMSEX: Cronbach’s $\alpha$ coefficients range from $.90$ to $.96$ across married, cohabiting, dating, and sexual-minority samples (Cohen, 2008; Lawrance & Byers, 1995; Peck, Shaffer, & Williamson, 2004).
• GMREL: Cronbach’s $\alpha$ coefficients range from $.91$ to $.96$ across diverse cohorts (Renaud et al., 1997).

Temporal Stability (Test-Retest Reliability)

Longitudinal evaluations reported by Byers and MacNeil (2006) and Lawrance and Byers (1995) establish test-retest reliability across diverse intervals:

• Two-Week Interval: $r = .84$ for GMSEX; $r = .81$ for GMREL.
• Three-Month Interval: $r = .78$ for GMSEX; $r = .70$ for GMREL.
• Eighteen-Month Interval: $r = .73$ for GMSEX; $r = .61$ for GMREL.

In contrast to the high stability of global satisfaction measures, the specific exchange components ($REW$, $CST$, $CLREW$, $CLCST$, and difference scores) display moderate test-retest correlations across 3 months ($r = .43 ext{–}.67$) and 18 months ($r = .25 ext{–}.56$). This lower temporal stability is theoretically consistent: specific rewards, costs, and cognitive comparison thresholds fluctuate as relationship events, stressors, and developmental transitions occur over time.

Factor Analysis

Confirmatory factor analyses (CFA) and exploratory structural models support the unidimensional structure of the GMSEX and GMREL, alongside the distinct, multidimensional architecture of the Exchanges Questionnaire.

Unidimensionality of GMSEX and GMREL

Principal component analyses and maximum likelihood CFA consistently show that the 5 bipolar items of the GMSEX load on a single latent factor representing global sexual satisfaction, accounting for over $75%$ of the total variance, with factor loadings exceeding $.82$ across items (Good-Bad, Pleasant-Unpleasant, Positive-Negative, Satisfying-Unsatisfying, Valuable-Worthless). The GMREL similarly demonstrates a single-factor structure accounting for over $78%$ of variance, with loadings ranging from $.84$ to $.94$. Inter-item correlations are uniform, and fit indices consistently meet criteria for good model fit ($CFI > .97$, $TLI > .96$, $RMSEA < .06$).

Structural Modeling of the IEMSS System

Structural equation modeling (SEM) confirms that while GMSEX and GMREL correlate substantially ($r \approx .55 ext{–}.65$), they constitute distinct latent constructs rather than a single generalized evaluative factor. Confirmatory dyadic analyses (actor-partner interdependence modeling, APIM) demonstrate that an individual’s sexual satisfaction is shaped by both their own exchange assessments (actor effects) and their partner’s perceived balance and equality scores (partner effects), further verifying the relational construct validity of the framework.

Instrument / Measurement Tool

• Instrument Type: Multi-component self-report assessment battery.
• Components:
  • Global Measure of Sexual Satisfaction (GMSEX): 5 items.
  • Global Measure of Relationship Satisfaction (GMREL): 5 items.
  • Exchanges Questionnaire: 6 core items measuring direct rewards, comparison levels, and equality for both rewards and costs.
  • Rewards/Costs Checklist (RCC): 58 items completed under two instructional sets (Rewards and Costs).
• Response Scales:
  • GMSEX & GMREL: 7-point bipolar semantic differential scale (1 to 7).
  • Exchanges Questionnaire: 9-point Likert scales (anchors vary from 1 = “Not at all” to 9 = “Extremely”, or -4 to +4 relative anchors).
  • Rewards/Costs Checklist: Dichotomous endorsement (Reward vs. Not a Reward; Cost vs. Not a Cost).
• Administration Time: Approximately 10 minutes for the GMSEX, GMREL, and Exchanges Questionnaire combined; an additional 10 minutes for the 58-item RCC.
• Scoring Algorithms:
  • GMSEX Total: Sum of items 1 to 5. Range: 5 to 35. Higher scores indicate greater sexual satisfaction.
  • GMREL Total: Sum of items 1 to 5. Range: 5 to 35. Higher scores indicate greater overall relationship satisfaction.
  • Reward-Cost Balance ($REW – CST$): Calculated by subtracting the 9-point Cost score from the 9-point Reward score. Range: -8 to +8.
  • Comparison Level Balance ($CLREW – CLCST$): Calculated by subtracting the 9-point Comparison Level for Costs from the 9-point Comparison Level for Rewards. Range: -8 to +8.
  • Perceived Equality of Rewards ($EQREW$) and Costs ($EQCST$): Folded scoring system. The 9-point scale midpoint (representing perfect equality between partners) is scored as 4; responses deviating one step in either direction are scored 3; two steps scored 2; three steps scored 1; and extreme endpoints (maximum asymmetry) scored 0. Range: 0 to 4.
  • Checklist Totals: Sum of total rewards endorsed and sum of total costs endorsed across the 58 behavioral domains.

Permissions & Fee and Test Year

The Interpersonal Exchange Model of Sexual Satisfaction Questionnaire was first published in 1992 and fully articulated in its primary psychometric form in 1995 by Dr. Kelli-an Lawrance and Dr. E. Sandra Byers. The instruments (GMSEX, GMREL, Exchanges Questionnaire, and Rewards/Costs Checklist) are copyrighted by the authors and the original publishing journals (Canadian Journal of Human Sexuality; Personal Relationships, Wiley-Blackwell). The scale is made accessible without fee for non-commercial academic research and clinical training purposes. Researchers and clinicians wishing to use the IEMSS should consult the primary publications or contact the authors (e.g., Dr. E. Sandra Byers at the University of New Brunswick) to request formal permission and the full scoring manuals.

References

• Byers, E. S., & MacNeil, S. (2006). Further validation of the Interpersonal Exchange Model of Sexual Satisfaction. Journal of Sex & Marital Therapy, 32(1), 53–69. https://doi.org/10.1080/00926230500230677
• Cohen, J. N. (2008). Minority stress, resilience, and sexual functioning in sexual-minority women (Unpublished doctoral dissertation). University of New Brunswick, Fredericton, Canada.
• Cohen, J. N., Byers, E. S., & Walsh, L. P. (2008). Factors influencing the sexual relationships of lesbians and gay men. International Journal of Sexual Health, 20(3), 162–176. https://doi.org/10.1080/19317610802240167
• Homans, G. C. (1961). Social behavior: Its elementary forms. Harcourt, Brace & World.
• Hudson, W. W., Harrison, D. F., & Crosscup, P. C. (1981). A short-form scale to measure sexual discord in dyadic relationships. The Journal of Sex Research, 17(2), 157–174. https://doi.org/10.1080/00224498109551128
• Kelley, H. H., & Thibaut, J. W. (1978). Interpersonal relations: A theory of interdependence. John Wiley & Sons.
• Lawrance, K., & Byers, E. S. (1992). Development of the Interpersonal Exchange Model of Sexual Satisfaction in long-term relationships. Canadian Journal of Human Sexuality, 1(3), 123–128.
• Lawrance, K., & Byers, E. S. (1995). Sexual satisfaction in long-term heterosexual relationships: The Interpersonal Exchange Model of Sexual Satisfaction. Personal Relationships, 2(4), 267–285. https://doi.org/10.1111/j.1475-6811.1995.tb00092.x
• MacNeil, S., & Byers, E. S. (2009). Role of sexual self-disclosure in the sexual satisfaction of long-term heterosexual couples. The Journal of Sex Research, 46(1), 3–14. https://doi.org/10.1080/00224490802398399
• Peck, S. R., Shaffer, D. R., & Williamson, G. M. (2004). Sexual satisfaction and relationship satisfaction in dating couples: The contributions of relationship communality and favorability of sexual exchanges. Journal of Psychology & Human Sexuality, 16(4), 17–37. https://doi.org/10.1300/J056v16n04_02
• Renaud, C. A., & Byers, E. S. (2001). Positive and negative sexual cognitions: Subjective experience and relationships to sexual adjustment. The Journal of Sex Research, 38(3), 252–262. https://doi.org/10.1080/00224490109552094
• Renaud, C. A., Byers, E. S., & Pan, S. (1997). Sexual and relationship satisfaction in mainland China. The Journal of Sex Research, 34(4), 399–410. https://doi.org/10.1080/00224499709551907
• 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/10.2307/351627
• Thibaut, J. W., & Kelley, H. H. (1959). The social psychology of groups. John Wiley & Sons.
• Walster, E., Walster, G. W., & Berscheid, E. (1978). Equity: Theory and research. Allyn and Bacon.

Items of the Scale