Joshua Grubbs

Associate Professor, Department of Psychology
B.S. Liberty University, 2010
M.A. Case Western Reserve University, 2012
Ph.D. Case Western Reserve University, 2016
Pre-doctoral Internship: Louis Stokes Cleveland Veteran’s Affairs Medical Center  

Phone: (419) 372-2045
Office: Room 246, Psychology Building
Lab Page: N/A

Taking Graduate Students? Yes
Sponsoring Undergraduate Research? Yes

Research Interests:

My research (and the research of the SPARTA lab) falls primarily into three domains: the psychology of religion and spirituality, the psychology of human sexuality, and the psychology of addiction.  With regards to religion and spirituality, I have a particular interest in the religious and spiritual struggles, crises of faith, religiously-based moral emotions, feelings of doubt or exit from faith, and the role of personality in shaping religious and spiritual experiences.  With regards to the psychology of human sexuality, I am very interested in the role that technology plays in shaping human sexual behaviors. To this end, I have a number of ongoing research projects examining internet pornography use and online sexuality.  Finally, in regards to addiction, I have past and ongoing projects related to perceived addiction to internet pornography, hypersexual behavior more broadly, and pathological gambling.  In addition to these domains, I am also interested in the Open Science movement more broadly and in promoting replicability, reproducibility, and transparency in the scientific process.  I strive to conduct my research in accordance with current standards of transparency and openness, and I encourage my students to do the same. You can find more information about my current projects at my Open Science Framework page ( and a complete list of my publications at my Google Scholar page (

“More information about my research interests, ongoing projects, and the SPARTA Lab can be found at my website:”

Selected Publications:

Grubbs, Joshua Briggs, and Jennifer Tegan Grant. “Spirituality/religion and Behavioral Addictions.” Spirituality/religion and Behavioral Addictions. Ed. David H. Rosmarin and Harold G. Koenig. Elsevier, 2020. 139–157.

Grubbs, J. B., & Exline, J. J. (2016). Trait entitlement: A cognitive-personality source of vulnerability to psychological distress. Psychological Bulletin, 142, 1204–1226.

Grubbs, J. B., Exline, J. J., Campbell, W. K., Twenge, J. M., & Pargament, K. I. (2017). God owes me: The role of divine entitlement in predicting struggles with a deity. Psychology of Religion and Spirituality.

Grubbs, J. B., Exline, J. J., Pargament, K. I., Hook, J. N., & Carlisle, R. D. (2015). Transgression as addiction: religiosity and moral disapproval as predictors of perceived addiction to pornography. Archives Of Sexual Behavior, 44, 125–136.

Grubbs, J. B., & Perry, S. L. (2018). Moral Incongruence and Pornography Use: A Critical Review and Integration. The Journal of Sex Research, 1–9.

Grubbs, J. B., Perry, S. L., Wilt, J. A., & Reid, R. C. (2018) Pornography Problems Due to Moral Incongruence: An Integrative Model with a Systematic Review and Meta-Analysis. Archives of Sexual Behavior (Online First). DOI: 10.1007/s10508-018-1248-x    

Grubbs, J. B., Stauner, N., Exline, J. J., Pargament, K. I., & Lindberg, M. J. (2015). Perceived addiction to Internet pornography and psychological distress: Examining relationships concurrently and over time. Psychology of Addictive Behaviors, 29, 1056.

Grubbs, J. B., Wilt, J. A., Exline, J. J., & Pargament, K. I. (2018). Predicting pornography use over time: Does self-reported “addiction” matter? Addictive Behaviors, 82, 57–64.

Grubbs, J. B., Wilt, J. A., Exline, J. J., Pargament, K. I., & Kraus, S. W. (2018). Moral disapproval and perceived addiction to internet pornography: A longitudinal examination. Addiction, 113, 496–506.

Grubbs, J. B., Wilt, J., Stauner, N., Exline, J. J., & Pargament, K. I. (2016). Self, struggle, and soul: Linking personality, self-concept, and religious/spiritual struggle. Personality and Individual Differences, 101, 144–152.

Rasmussen, K. R., Grubbs, J. B., Pargament, K. I., & Exline, J. J. (2018). Social desirability bias in pornography-related self-reports: The role of religion. Journal of Sex Research, 55, 381–394.

Courses Taught:

  • PSYC 4150 Psychology of Religion and Spirituality
  • PSYC 6150 Psychotherapy Team

Updated: 05/18/2021 07:23PM