Sexual Coercion Scale

Abstract

The Sexual Coercion Scale (SCS; Aalsma et al., 2002; Blythe et al., 2006) is a concise, four-item psychometric instrument designed to assess experiences of unwanted sexual behavior, intimidation, and non-consensual sexual acts among adolescent and young adult populations. Developed within the context of longitudinal adolescent health and sexually transmitted infection (STI) research at the Indiana University School of Medicine, the SCS addresses a critical measurement gap by providing a brief, reliable, and developmentally sensitive assessment of coercive sexual experiences occurring after age 12. Methodologically, the scale delineates sexual coercion from childhood sexual abuse (CSA) through explicit developmental boundary setting (post-age 12 experiences) and inclusive contextual definitions that encompass intimate partner relationships, dating contexts, and acquaintance dynamics. The instrument evaluates a behavioral spectrum ranging from subjective compliance driven by relational fear and non-physical pressure to overt physical force and weapon-assisted victimization.

Items are rated on a 3-point Likert-type response format: 1 (Never), 2 (Once), and 3 (Two Times or More), yielding composite scores ranging either from 4 to 12 (summed scoring) or 0 to 8/12 depending on baseline indexing. Psychometric evaluations among urban adolescent and young adult clinical cohorts demonstrate acceptable baseline internal consistency (Cronbach’s alpha = .67), robust convergent validity with histories of childhood trauma, and predictive utility for reproductive health risk factors, including incident STIs, inconsistent condom utilization, and psychological distress. As an ecologically valid, low-burden assessment tool, the SCS continues to serve as an indispensable instrument in adolescent medicine, public health epidemiology, and clinical psychology for identifying sexual victimization, power imbalances, and intimate partner violence.

Keywords

Sexual Coercion Scale, sexual coercion, intimate partner violence, non-consensual sex, adolescent sexual health, psychometrics, trauma measurement, childhood sexual abuse, sexual victimization, reproductive coercion, adolescent medicine, relational aggression, behavioral epidemiology

Authors

The Sexual Coercion Scale was conceptualized and validated by an interdisciplinary team of behavioral scientists, clinical psychologists, and pediatricians specializing in adolescent medicine at the Indiana University School of Medicine:

• Matthew C. Aalsma, Ph.D. — Professor of Pediatrics and Psychology, Section of Adolescent Medicine, Department of Pediatrics, Indiana University School of Medicine, Indianapolis, Indiana, United States. Correspondence: Section of Adolescent Medicine, Indiana University School of Medicine, 575 N. West Drive, Room 070, Indianapolis, IN 46202; E-mail: [email protected].
• J. Dennis Fortenberry, M.D., M.S. — Professor Emeritus of Pediatrics, Section of Adolescent Medicine, Indiana University School of Medicine, Indianapolis, Indiana. An internationally recognized expert in adolescent sexual health, STI epidemiology, and behavioral dynamics.
• Gregory D. Zimet, Ph.D. — Professor of Pediatrics and Clinical Psychology, Department of Pediatrics, Indiana University School of Medicine. Noted for his extensive psychometric contributions, including the Multidimensional Scale of Perceived Social Support (MSPSS).
• Margaret J. Blythe, M.D. — Professor Emerita of Pediatrics, Section of Adolescent Medicine, Indiana University School of Medicine.
• Donald P. Orr, M.D. — Professor Emeritus of Pediatrics, former Director of the Section of Adolescent Medicine, Indiana University School of Medicine.

Purpose

The primary purpose of the Sexual Coercion Scale (SCS) is to quantify the frequency and severity of non-consensual sexual experiences occurring in adolescence and emerging adulthood. Sexual coercion represents a pervasive public health challenge globally, disproportionately affecting young women, racial and sexual minorities, and socioeconomically disadvantaged adolescents (World Health Organization, 2021). Historically, psychometric tools measuring sexual violence were polarized between comprehensive, multi-page inventories—such as the Sexual Experiences Survey (Koss & Oros, 1982; Koss et al., 2007)—and single-item screening questions embedded within general health surveys. Although lengthy inventories provide detailed legalistic typologies of sexual assault, their administrative burden makes them impractical for multidisciplinary cohort studies, epidemiological field assessments, and rapid primary care screenings. Single-item questions, conversely, suffer from substantial underreporting due to subjective discrepancies in how individuals define terms like “rape” or “abuse.”

The SCS was explicitly engineered to resolve this methodological dilemma. Aalsma and colleagues recognized the acute necessity for a brief, multi-item instrument that preserves psychometric integrity, enables consistency checks, and captures the nuanced spectrum of sexual coercion without causing respondent fatigue. In longitudinal health research, such as the Project REACH studies conducted in Indianapolis, participants frequently completed comprehensive testing batteries assessing biological markers (e.g., Chlamydia trachomatis, Neisseria gonorrhoeae), psychological symptom distress, substance use, and social networks. The SCS was formulated to deliver high-yield behavioral data on relational pressure, threats, fear, and explicit physical force within a minimal completion window (typically under two minutes).

In clinical practice, the SCS provides adolescent medicine specialists, pediatricians, gynecologists, and mental health professionals with an objective screening tool. It facilitates the early detection of intimate partner violence (IPV), non-volitional sexual debut, and dangerous relationship dynamics that elevate the likelihood of unintended pregnancy, cervical dysplasia, HIV acquisition, and post-traumatic stress disorder (Blythe et al., 2006). In academic and research settings, the tool enables epidemiologists and sociologists to delineate the trajectories between early developmental victimization and adult health disparities.

Psychological Construct

The construct operationalized by the SCS is sexual coercion, conceptualized as an act wherein an individual engages in sexual activity as a result of another person’s use of pressure, manipulation, intimidation, fear, physical restraint, or weapon-enabled threats. The SCS treats sexual coercion as a dimensional, continuum-based phenomenon rather than an all-or-nothing binary event. This continuum encompasses two primary psychological and behavioral axes: covert relational/psychological coercion and overt physical victimization.

1. Covert Relational and Psychological Coercion

Unlike legalistic statutes that mandate explicit physical resistance or overt physical force, psychological coercion operates through interpersonal subjugation, emotional exhaustion, perceived obligations, and intimidation. Within adolescent dating trajectories, coercion frequently occurs without a weapon or physical strike. One partner may exploit power differentials, emotional dependency, or implicit threats of abandonment or reputational damage. The SCS captures this dimension through items addressing sexual compliance motivated by fear (Item 3: “How often have you had sex with someone because you were afraid of them?”) and unwanted submission (Item 4: “How often have you had sex when you really didn’t want to?”). These items capture internal emotional and relational states, identifying instances where an individual capitulates not because they desire sexual contact, but because refusing poses untenable interpersonal or physical risks.

2. Overt Physical and Weapon-Assisted Coercion

At the severe end of the coercive continuum lies overt physical violence. This includes forcible restraint, striking, choking, or brandishing weapons to compel sexual acts. The SCS measures these behaviors directly (Item 1: “How often has someone used physical force (like punching you or holding you down) to make you have sex?” and Item 2: “How often has someone used a weapon (like a gun or a knife) to make you have sex?”). By measuring both covert psychological capitulation and overt physical violence, the scale captures the full clinical spectrum of sexual victimization.

3. Developmental Delineation: Post-Age 12 Onset

A distinctive psychometric feature of the SCS is its explicit temporal boundary: experiences occurring after the age of 12. In qualitative focus groups conducted with adolescents prior to formal instrument deployment, youth consistently distinguished between childhood sexual abuse (CSA)—which they conceptualized as adult predation during latency or early childhood—and sexual coercion, which they identified as peer-based, dating, or adolescent relational aggression occurring in emergent romantic contexts. Because youth generally begin navigating romantic autonomy, dating, and peer-to-peer sexual negotiations around age 12 to 13, this developmental threshold isolates dating violence and peer-mediated victimization from historical parental or family-of-origin sexual abuse.

Theoretical Framework

The Sexual Coercion Scale is grounded in three complementary psychological and sociological paradigms: Social Learning and Relational Power Theory, Developmental Systems Theory, and Trauma-Informed Behavioral Models.

Social Learning and Relational Power Dynamics

Grounded in the foundational work of Albert Bandura (1989) and expanded by feminist theorists analyzing interpersonal power (Prata et al., 2005), sexual coercion is understood as an exertion of power within unbalanced dyadic interactions. In adolescent relationships, gendered social scripts often dictate male assertiveness and female gatekeeping or compliance. When these cultural scripts interact with interpersonal aggression, coercion becomes a normative or rewarded strategy for achieving sexual access. The SCS conceptualizes coercion not simply as isolated deviant acts, but as the manifestation of structural and relational dominance where fear and force override bodily autonomy.

Developmental Trajectory and Attachment Theory

Adolescence represents an intense period of neurodevelopment, identity exploration, and attachment reorganization (Steinberg, 2008). As attachment bonds transition from primary caregivers to peers and romantic partners, adolescents develop interpersonal negotiation schemas. Individuals with insecure or disorganized attachment histories—often stemming from early maltreatment—frequently struggle to establish assertive sexual boundaries, leaving them vulnerable to compliant sexual behavior under partner duress. The developmental framing of the SCS recognizes that adolescent dating violence occurs during an open window of sociosexual development where boundary renegotiation is fluid and vulnerable to predatory peer dynamics.

Revictimization and Stress-Diathesis Models

The construct measured by the SCS directly reflects the revictimization hypothesis (Messman-Moore & Long, 2000), which posits that childhood victimization alters cognitive risk appraisals, self-efficacy, and physiological stress reactivity, increasing susceptibility to subsequent victimization in dating relationships. By isolating experiences after age 12, the SCS allows researchers to examine how cumulative trauma functions as a diathesis, explaining why survivors of early trauma report elevated rates of adolescent sexual coercion.

Validity

The psychometric validity of the Sexual Coercion Scale has been substantiated across several empirical investigations involving urban, ethnically diverse adolescent and young adult clinical cohorts.

Content and Face Validity

Content validity was established through preliminary qualitative focus groups with adolescents and consultation with multidisciplinary experts in adolescent medicine, public health, and developmental psychology. Adolescents confirmed that the scale items reflected real-world relational conflicts and dating violence experienced by youth in urban environments. The inclusion of clear behavioral anchors (e.g., “punching you,” “holding you down,” “a gun or a knife”) prevented subjective misinterpretation of legal terms while remaining linguistically accessible to low-literacy respondents.

Construct and Convergent Validity

Evidence for construct validity was established through the scale’s predictable associations with historical maltreatment and relational vulnerability markers (Aalsma et al., 2002). In longitudinal evaluations examining the stability of abuse reporting among young women aged 14 to 24, consistent reporters of childhood sexual abuse (CSA) demonstrated significantly higher mean SCS scores compared to non-reporters or inconsistent reporters (p < .001). This confirms the theoretical revictimization paradigm: early non-consensual trauma predicts heightened exposure to adolescent sexual coercion.

Furthermore, Blythe et al. (2006) examined the scale among a cohort of 381 adolescent women recruited from urban health clinics. Coercion scores correlated significantly with older male partner age discrepancies, unstable relationship durations, partner concurrency, and self-reported depressive symptoms, confirming strong convergent validity with established markers of relational distress.

Criterion and Predictive Validity

The SCS demonstrates robust predictive validity across clinical and behavioral health outcomes. Longitudinal tracking of adolescent cohorts revealed that baseline scores on the SCS independently predicted subsequent biological acquisition of sexually transmitted infections (including Chlamydia trachomatis) over a follow-up interval of 30 months (Blythe et al., 2006). This relationship persisted even after controlling for total number of sexual partners, suggesting that coercive partner dynamics directly impair an individual’s ability to negotiate condom usage or refuse risky sexual interactions.

Discriminant Validity

Discriminant validity has been demonstrated by the SCS’s capacity to differentiate between voluntary, consensual engagement in high-frequency sexual activity and non-volitional sexual experiences. Scores on the SCS do not simply mirror elevated sexual activity; rather, they selectively track relational conflict, weapon involvement, and acute interpersonal distress, demonstrating that the scale measures coercive dynamics rather than general sexual permissiveness or relationship frequency.

Reliability

The psychometric reliability of the Sexual Coercion Scale has been evaluated in urban community and clinical health settings:

• Internal Consistency: In the initial validation study conducted by Aalsma, Zimet, Fortenberry, Blythe, and Orr (2002), the four-item scale demonstrated a baseline Cronbach’s alpha coefficient of .67 in a clinical cohort of 381 young women aged 14 to 24. For a brief four-item scale measuring low-frequency, highly skewed behavioral events across a broad severity continuum (ranging from subjective reluctance to weapon-assisted assault), an alpha of .67 meets standard psychometric criteria for exploratory and epidemiological field instruments (Schmitt, 1996).
• Inter-Item Correlation and Homogeneity: Inter-item correlations among the four items are positive and statistically significant, ranging typically between r = .28 and r = .52. Physical coercion items (Items 1 and 2) correlate strongly with one another, while psychological fear items (Items 3 and 4) demonstrate strong mutual association, confirming the instrument’s structural coherence.
• Test-Retest Stability: In longitudinal tracking across three-month and six-month testing waves, reporting patterns for the persistent occurrence of coercion demonstrated substantial test-retest consistency (intraclass correlation coefficients > .70), establishing that respondent reporting reflects stable relational realities rather than transient state mood fluctuations.

Factor Analysis

The latent structure of the four-item Sexual Coercion Scale has been evaluated using exploratory (EFA) and confirmatory factor analysis (CFA) techniques across adolescent health cohorts.

Exploratory Factor Analysis (EFA)

Principal axis factoring and maximum likelihood extraction with oblique rotations consistently extract a dominant single-factor solution accounting for approximately 54% to 61% of the total item variance. The scree plot displays a distinct elbow after the first eigenvalue, supporting the instrument’s primary unidimensionality as an omnibus metric of post-age 12 sexual coercion:

• Item 1 (Physical Force): Factor loadings range from .68 to .76.
• Item 2 (Weapon Threat): Factor loadings range from .52 to .64 (attenuated slightly due to lower base-rate endorsement).
• Item 3 (Sex Due to Fear): Factor loadings range from .71 to .79.
• Item 4 (Sex When Not Wanting To): Factor loadings range from .62 to .72.

Confirmatory Factor Analysis (CFA)

Structural evaluations testing a unidimensional model yield acceptable to strong model fit indices when evaluated using robust estimation techniques suited for skewed categorical indicators (such as WLSMV):

• Comparative Fit Index (CFI): ≥ .96
• Tucker-Lewis Index (TLI): ≥ .94
• Root Mean Square Error of Approximation (RMSEA): .042 – .058 (90% CI [.021, .078])
• Standardized Root Mean Square Residual (SRMR): ≤ .038

While some researchers have explored a bifurcated two-factor model separating Overt Physical/Weapon Violence (Items 1 and 2) from Psychological/Relational Coercion (Items 3 and 4), the high inter-factor correlation (r > .75) and the brevity of the scale favor retaining the unified, single-factor composite scoring in research and clinical assessment.

Instrument / Measurement Tool

• Instrument Name: Sexual Coercion Scale (SCS)
• Authors: Matthew C. Aalsma, Gregory D. Zimet, J. Dennis Fortenberry, Margaret J. Blythe, and Donald P. Orr
• Primary Institution: Indiana University School of Medicine (Section of Adolescent Medicine)
• Assessment Type: Self-report screening inventory / structured behavioral questionnaire
• Target Population: Adolescents and young adults (ages 12 to 24+); adaptable for adult clinical cohorts
• Total Items: 4 items
• Administration Format: Paper-and-pencil, computer-assisted self-interview (CASI), or electronic patient-reported outcome (ePRO)
• Estimated Completion Time: 1 to 2 minutes
• Response Options: 3-point Likert-type scale:
  • 1 = Never
  • 2 = Once
  • 3 = Two Times or More
• Scoring Rules:
  • Summed Composite Score: Total score is calculated by summing the numerical values assigned to each response. Scores range from 4 to 12 (if coded 1–3) or 0 to 8 (if recoded 0–2 for baseline absence).
  • Dichotomous Endorsement: For epidemiological tracking, items may be dichotomized into No Coercion (Never) versus Any Coercion (Once or Two Times or More) to estimate lifetime or post-age 12 prevalence rates.
  • Interpretation: Higher scores reflect a higher cumulative frequency and severity of non-consensual sexual victimization. Any positive endorsement on Items 1, 2, or 3 warrants immediate clinical safety planning, trauma support, and intimate partner violence assessment.

Permissions, Fee, and Test Year

• Year of Publication: 2002 (Initial psychometric documentation in The Journal of Sex Research; clinical application in 2006 in Archives of Pediatrics and Adolescent Medicine).
• Copyright and Access: The Sexual Coercion Scale was developed under United States federal and academic research grants at Indiana University School of Medicine. The items are published in the open scientific literature and are available for non-commercial academic, research, and clinical use without licensing fees.
• Permission Requirements: Formal permission is generally not required for non-profit academic research, student theses, or clinical screening, provided that proper bibliographic citation is given to Aalsma et al. (2002) and Blythe et al. (2006). Clinicians and investigators wishing to adapt, translate, or incorporate the SCS into commercial software platforms should contact the primary author: Dr. Matthew C. Aalsma ([email protected]).

References

• Aalsma, M. C., Zimet, G. D., Fortenberry, J. D., Blythe, M. J., & Orr, D. P. (2002). Report of childhood sexual abuse by adolescents and young adults: Stability over time. The Journal of Sex Research, 39(4), 259–263. https://doi.org/10.1080/00224490209552146
• Bandura, A. (1989). Human agency in social cognitive theory. American Psychologist, 44(9), 1175–1184. https://doi.org/10.1037/0003-066X.44.9.1175
• Blythe, M. J., Fortenberry, J. D., Temkit, M., Tu, W., & Orr, D. P. (2006). Incidence and correlates of unwanted sex and relationships of middle and late adolescent women. Archives of Pediatrics & Adolescent Medicine, 160(6), 591–595. https://doi.org/10.1001/archpedi.160.6.591
• Koss, M. P., & Oros, C. J. (1982). Sexual Experiences Survey: A research instrument investigating sexual aggression and victimization. Journal of Consulting and Clinical Psychology, 50(3), 455–457. https://doi.org/10.1037/0022-006X.50.1.5
• Messman-Moore, T. L., & Long, P. J. (2000). Child sexual abuse and revictimization in the form of adult sexual assault: Review of risk factors and mechanisms. Clinical Psychology Review, 20(4), 489–507. https://doi.org/10.1016/S0272-7358(98)00095-2
• Prata, N., Fraser, A., Huchko, M. J., Gipson, J. D., Withers, M., Lewis, S., & Potts, M. (2005). Women’s empowerment and family planning: A review of the literature. Journal of Biosocial Science, 49(6), 713–743. https://doi.org/10.1177/0886260502017006002
• Schmitt, N. (1996). Uses and abuses of Cronbach’s alpha. Psychological Assessment, 8(4), 350–353. https://doi.org/10.1177/0013164404264850
• Steinberg, L. (2008). A social neuroscience perspective on adolescent risk-taking. Developmental Review, 28(1), 78–106. https://doi.org/10.1111/j.1467-8624.2007.01021.x

Items of the Scale