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Pornography Use and Holistic Sexual Functioning: a Systematic Review of Recent Research

  • Internet Use Disorders (HJ Rumpf and J Billieux, Section Editors)
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Abstract

Purpose of Review

Pornography use is a common recreational activity in most developed nations with unrestricted internet access. As public awareness of pornography’s popularity has grown, so have concerns about potentially deleterious effects of pornography. One domain of particular concern has been the impact of pornography use and online sexual behaviors on sexual wellbeing. Over recent years, a number of studies have examined how pornography use relates to sexual wellbeing. The present work seeks to review such literature, with a particular focus on the effects of pornography on sexual functioning and sexual satisfaction. To this end, a systematic review of recent research (within the past 5 years) was conducted.

Recent Findings

A total of 44 articles were included in the systematic review. In some situations, pornography use is associated with greater sexual functioning and greater sexual satisfaction, and in other cases it seems to be associated with lower sexual functioning and lower sexual satisfaction. Specifically, mere pornography use itself was most often not associated with sexual functioning in either direction, but self-reported problematic use of pornography was consistently associated with more sexual functioning problems.

Summary

Collectively, results suggest a nuanced understanding of the effects of pornography on sexual wellbeing, with the context of and perceptions about pornography use being extremely important in predicting whether or not pornography has negative effects.

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Notes

  1. This particular study assessed problematic online sexual activities broadly, but found that over 90% of the sample was referring to pornography use when describing or responding to questions about their online sexual activities.

References

Papers of particular interest, published recently, have been highlighted as: •• Of major importance

  1. The 2019 Year in Review – Pornhub Insights. In: Pornhub [Internet]. 11 Dec 2019 [cited 19 Jun 2020]. Available: https://www.pornhub.com/insights/2019-year-in-review

  2. Price J, Patterson R, Regnerus M, Walley J. How much more xxx is generation x consuming? Evidence of changing attitudes and behaviors related to pornography since 1973. J Sex Res. 2016;53:12–20. https://doi.org/10.1080/00224499.2014.1003773.

    Article  PubMed  Google Scholar 

  3. Barrada JR, Ruiz-Gómez P, Correa AB, Castro Á. Not all Online Sexual Activities Are the Same. Front Psychol. 2019;10:339. https://doi.org/10.3389/fpsyg.2019.00339.

    Article  PubMed  PubMed Central  Google Scholar 

  4. Bennett M, LoPresti BJ, McGloin R, Denes A. The Desire for Porn and Partner?: Investigating the Role of Scripts in Affectionate Communication, Sexual Desire, and Pornography Consumption and Guilt in Young Adults’ Romantic Relationships. West J Commun. 2019;83:647–67. https://doi.org/10.1080/10570314.2018.1564934.

    Article  Google Scholar 

  5. Berger JH, Kehoe JE, Doan AP, Crain DS, Klam WP, Marshall MT, et al. Survey of Sexual Function and Pornography. Mil Med. 2019;184:731–7. https://doi.org/10.1093/milmed/usz079.

    Article  PubMed  Google Scholar 

  6. Vaillancourt-Morel M-P, Blais-Lecours S, Labadie C, Bergeron S, Sabourin S, Godbout N. Profiles of Cyberpornography Use and Sexual Well-Being in Adults. J Sex Med. 2017;14:78–85. https://doi.org/10.1016/j.jsxm.2016.10.016.

    Article  PubMed  Google Scholar 

  7. Bőthe B, Tóth-Király I, Bella N, Potenza MN, Demetrovics Z, Orosz G. Why do people watch pornography? The motivational basis of pornography use. Psychol Addict Behav J Soc Psychol Addict Behav. 2020. https://doi.org/10.1037/adb0000603.

  8. Bőthe B, Tóth-Király I, Demetrovics Z, Orosz G. The pervasive role of sex mindset: Beliefs about the malleability of sexual life is linked to higher levels of relationship satisfaction and sexual satisfaction and lower levels of problematic pornography use. Personal Individ Differ. 2017;117:15–22. https://doi.org/10.1016/j.paid.2017.05.030.

    Article  Google Scholar 

  9. •• Bőthe B, Tóth-Király I, Griffiths MD, Potenza MN, Orosz G, Demetrovics Z. Are sexual functioning problems associated with frequent pornography use and/or problematic pornography use? Results from a large community survey including males and females. Addict Behav. 2021;112:106603. https://doi.org/10.1016/j.addbeh.2020.106603Provides an in-depth examination of the differences between problematic pornography use and pornography use frequency in predicting sexual functioning in both men and women.

    Article  PubMed  Google Scholar 

  10. •• Bőthe B, Vaillancourt-Morel M-P, Bergeron S. Associations Between Pornography Use Frequency, Pornography Use Motivations, and Sexual Wellbeing in Couples. J Sex Res. 2021;0:1–15. https://doi.org/10.1080/00224499.2021.1893261Provides an empirical investigation of the effects of pornography use and motives for pornography use on the sexual functioning of couples, including sexual satisfaction outcomes.

    Article  Google Scholar 

  11. Brown CC, Carroll JS, Yorgason JB, Busby DM, Willoughby BJ, Larson JH. A common-fate analysis of pornography acceptance, use, and sexual satisfaction among heterosexual married couples. Arch Sex Behav. 2017;46:575–84.

    Article  Google Scholar 

  12. Charig R, Moghaddam NG, Dawson DL, Merdian HL, das Nair R. A lack of association between online pornography exposure, sexual functioning, and mental well-being. Sex Relatsh Ther. 2020;35:258–81. https://doi.org/10.1080/14681994.2020.1727874.

    Article  Google Scholar 

  13. Cranney S, Štulhofer A. “Whosoever looketh on a person to lust after them”: Religiosity, the use of mainstream and nonmainstream sexually explicit material, and sexual satisfaction in heterosexual men and women. J Sex Res. 2017;54:694–705. https://doi.org/10.1080/00224499.2016.1216068.

    Article  PubMed  Google Scholar 

  14. Daspe M-È, Vaillancourt-Morel M-P, Lussier Y, Sabourin S, Ferron A. When Pornography Use Feels Out of Control: The Moderation Effect of Relationship and Sexual Satisfaction. J Sex Marital Ther. 2018;44:343–53.

    Article  Google Scholar 

  15. Dwulit AD, Rzymski P. Prevalence, Patterns and Self-Perceived Effects of Pornography Consumption in Polish University Students: A Cross-Sectional Study. Int J Environ Res Public Health. 2019;16. https://doi.org/10.3390/ijerph16101861.

  16. Emmers-Sommer TM. Reasons for Pornography Consumption: Associations with Gender, Psychological and Physical Sexual Satisfaction, and Attitudinal Impacts. Sex Cult. 2018;22:48–62. https://doi.org/10.1007/s12119-017-9452-8.

    Article  Google Scholar 

  17. Floyd CG, Landa S, Saunders MA, Volk F. The Moderating Influence of Moral Disapproval of Pornography on Couples’ Sexual and Relationship Satisfaction. J Sex Marital Ther. 2020;0:1–23. https://doi.org/10.1080/0092623X.2020.1783409.

    Article  CAS  Google Scholar 

  18. French IM, Hamilton LD. Male-centric and female-centric pornography consumption: Relationship with sex life and attitudes in young adults. J Sex Marital Ther. 2018;44:73–86. https://doi.org/10.1080/0092623X.2017.1321596.

    Article  PubMed  Google Scholar 

  19. Gouvernet B, Rebelo T, Sebbe F, Hentati Y, Yougbaré S, Combaluzier S, et al. Is pornography pathogen by itself? Study of the role of attachment profiles on the relationship between pornography and sexual satisfaction. Sexologies. 2017;26:e27–33. https://doi.org/10.1016/j.sexol.2016.10.002.

    Article  Google Scholar 

  20. •• Grubbs JB, Gola M. Is pornography use related to erectile functioning? Results from cross-sectional and latent growth curve analyses. J Sex Med. 2019;16:111–25. https://doi.org/10.1016/j.jsxm.2018.11.004Provides a multi-sample cross-sectional and longitudinal examination of the links between pornography use frequency, feelings of addiction to pornography, and self-reported erectile functioning.

    Article  PubMed  Google Scholar 

  21. Gutiérrez-Puertas L, Hernández VM, Gutiérrez-Puertas V, Granados-Gámez G, Rodríguez-García MC, Aguilera-Manrique G. Online sexual activities among university students: relationship with sexual satisfaction. An Psicol Psychol. 2020;36:166–72.

    Article  Google Scholar 

  22. Hald GM, Stulhofer A, Lange T. Sexual Arousal and Sexually Explicit Media (SEM): Comparing Patterns of Sexual Arousal to SEM and Sexual Self-Evaluations and Satisfaction Across Gender and Sexual Orientation. Sex Med. 2018;6:30–8. https://doi.org/10.1016/j.esxm.2017.11.001.

    Article  PubMed  Google Scholar 

  23. Kowalewska E, Kraus SW, Lew-Starowicz M, Gustavsson K, Gola M. Which dimensions of human sexuality are related to compulsive sexual behavior disorder (CSBD)? Study using a multidimensional sexuality questionnaire on a sample of polish males. J Sex Med. 2019. https://doi.org/10.1016/j.jsxm.2019.05.006.

  24. Leonhardt ND, Willoughby BJ. Pornography, provocative sexual media, and their differing associations with multiple aspects of sexual satisfaction. J Soc Pers Relat. 2019;36:618–41. https://doi.org/10.1177/0265407517739162.

    Article  Google Scholar 

  25. McNabney SM, Hevesi K, Rowland DL. Effects of Pornography Use and Demographic Parameters on Sexual Response during Masturbation and Partnered Sex in Women. Int J Environ Res Public Health. 2020;17. https://doi.org/10.3390/ijerph17093130.

  26. Milas G, Wright P, Štulhofer A. Longitudinal Assessment of the Association Between Pornography Use and Sexual Satisfaction in Adolescence. J Sex Res. 2020;57:16–28. https://doi.org/10.1080/00224499.2019.1607817.

    Article  PubMed  Google Scholar 

  27. Miller DJ, McBain KA, Li WW, Raggatt PTF. Pornography, preference for porn-like sex, masturbation, and men’s sexual and relationship satisfaction. Pers Relat. 2019;26:93–113. https://doi.org/10.1111/pere.12267.

    Article  Google Scholar 

  28. Minarcik J, Wetterneck CT, Short MB. The effects of sexually explicit material use on romantic relationship dynamics. J Behav Addict. 2016;5:700–7. https://doi.org/10.1556/2006.5.2016.078.

    Article  PubMed  PubMed Central  Google Scholar 

  29. Pepping CA, Cronin TJ, Lyons A, Caldwell JG. The Effects of Mindfulness on Sexual Outcomes: The Role of Emotion Regulation. Arch Sex Behav. 2018;47:1601–12. https://doi.org/10.1007/s10508-017-1127-x.

    Article  PubMed  Google Scholar 

  30. Perry SL, Whitehead AL. Only Bad for Believers? Religion, Pornography Use, and Sexual Satisfaction Among American Men. J Sex Res. 2019;56:50–61. https://doi.org/10.1080/00224499.2017.1423017.

    Article  PubMed  Google Scholar 

  31. Rodrigues DL, Lopes D, Dawson K, de Visser R, Štulhofer A. With or Without You: Associations Between Frequency of Internet Pornography Use and Sexual Relationship Outcomes for (Non)Consensual (Non)Monogamous Individuals. Arch Sex Behav. 2020. https://doi.org/10.1007/s10508-020-01782-z.

  32. Ševčíková A, Blinka L, Škařupová K, Vašek D. Online Sex Addiction After 50: an Exploratory Study of Age-Related Vulnerability. Int J Ment Heal Addict. 2020 [cited 17 May 2021]. https://doi.org/10.1007/s11469-019-00200-3.

  33. Sun C, Bridges A, Johnson JA, Ezzell MB. Pornography and the male sexual script: An analysis of consumption and sexual relations. Arch Sex Behav. 2016;45:983–94. https://doi.org/10.1007/s10508-014-0391-2.

    Article  PubMed  Google Scholar 

  34. Tóth-Király I, Vallerand RJ, Bőthe B, Rigó A, Orosz G. Examining sexual motivation profiles and their correlates using latent profile analysis. Personal Individ Differ. 2019;146:76–86. https://doi.org/10.1016/j.paid.2019.04.002.

    Article  Google Scholar 

  35. Vaillancourt-Morel M-P, Rosen NO, Štulhofer A, Bosisio M, Bergeron S. Pornography Use and Sexual Health among Same-Sex and Mixed-Sex Couples: An Event-Level Dyadic Analysis. Arch Sex Behav. 2021;50:667–81. https://doi.org/10.1007/s10508-020-01839-z.

    Article  PubMed  Google Scholar 

  36. Wéry A, Billieux J. Online sexual activities: An exploratory study of problematic and non-problematic usage patterns in a sample of men. Comput Hum Behav. 2016;56:257–66. https://doi.org/10.1016/j.chb.2015.11.046.

    Article  Google Scholar 

  37. Willoughby BJ, Carroll JS, Busby DM, Brown CC. Differences in pornography use among couples: Associations with satisfaction, stability, and relationship processes. Arch Sex Behav. 2016;45:145–58. https://doi.org/10.1007/s10508-015-0562-9.

    Article  PubMed  Google Scholar 

  38. Willoughby BJ, Leonhardt ND. Behind Closed Doors: Individual and Joint Pornography Use Among Romantic Couples. J Sex Res. 2020;57:77–91. https://doi.org/10.1080/00224499.2018.1541440.

    Article  PubMed  Google Scholar 

  39. Willoughby BJ, Leonhardt ND, Augustus RA. Associations Between Pornography Use and Sexual Dynamics Among Heterosexual Couples. J Sex Med. 2021;18:179–92. https://doi.org/10.1016/j.jsxm.2020.10.013.

    Article  PubMed  Google Scholar 

  40. Wright PJ, Bridges AJ, Sun C, Ezzell MB, Johnson JA. Personal Pornography Viewing and Sexual Satisfaction: A Quadratic Analysis. J Sex Marital Ther. 2018;44:308–15. https://doi.org/10.1080/0092623X.2017.1377131.

    Article  PubMed  Google Scholar 

  41. •• Wright PJ, Herbenick D, Paul B, Tokunaga RS. Exploratory Findings on U.S. Adolescents’ Pornography Use, Dominant Behavior, and Sexual Satisfaction. Int J Sex Health. 2021;0:1–7. https://doi.org/10.1080/19317611.2021.1888170Using a subset of a U.S. nationally representative probability sample, this work provides a careful analysis of how pornography use may lead to sexual behaviors that ultimately reduce sexual satisfaction among adolescents.

    Article  Google Scholar 

  42. Wright PJ, Miezan E, Sun C. Pornography Consumption and Sexual Satisfaction in a Korean Sample. J Media Psychol. 2019;31:164–9. https://doi.org/10.1027/1864-1105/a000246.

    Article  Google Scholar 

  43. Wright PJ, Paul B, Herbenick D, Tokunaga RS. Pornography and Sexual Dissatisfaction: The Role of Pornographic Arousal, Upward Pornographic Comparisons, and Preference for Pornographic Masturbation. Hum Commun Res. 2021;47:192–214. https://doi.org/10.1093/hcr/hqab001.

    Article  Google Scholar 

  44. Wright PJ, Steffen NJ, Sun C. Is the Relationship Between Pornography Consumption Frequency and Lower Sexual Satisfaction Curvilinear? Results From England and Germany. J Sex Res. 2019;56:9–15. https://doi.org/10.1080/00224499.2017.1347912.

    Article  PubMed  Google Scholar 

  45. Wright PJ, Sun C, Steffen NJ, Tokunaga RS. Associative pathways between pornography consumption and reduced sexual satisfaction. Sex Relatsh Ther. 2019;34:422–39. https://doi.org/10.1080/14681994.2017.1323076.

    Article  Google Scholar 

  46. Nguyen HMT, Gabrielson AT, Hellstrom WJG. Erectile Dysfunction in Young Men—A Review of the Prevalence and Risk Factors. Sex Med Rev. 2017;5:508–20. https://doi.org/10.1016/j.sxmr.2017.05.004.

    Article  PubMed  Google Scholar 

  47. Weinberger JM, Houman J, Caron AT, Anger J. Female Sexual Dysfunction: A Systematic Review of Outcomes Across Various Treatment Modalities. Sex Med Rev. 2019;7:223–50. https://doi.org/10.1016/j.sxmr.2017.12.004.

    Article  PubMed  Google Scholar 

  48. Lawrance K, Byers ES. Development of the interpersonal exchange model of sexual satisfaction in long term relationships. Can J Hum Sex. 1992;1:123–8.

    Google Scholar 

  49. Meston C, Trapnell P. ORIGINAL RESEARCH—OUTCOMES ASSESSMENT: Development and Validation of a Five‐Factor Sexual Satisfaction and Distress Scale for Women: The Sexual Satisfaction Scale for Women (SSS‐W). J Sex Med. 2005;2:66–81. https://doi.org/10.1111/j.1743-6109.2005.20107.x.

    Article  PubMed  PubMed Central  Google Scholar 

  50. Philippsohn S, Hartmann U. Determinants of Sexual Satisfaction in a Sample of German Women. J Sex Med. 2009;6:1001–10. https://doi.org/10.1111/j.1743-6109.2008.00989.x.

    Article  PubMed  Google Scholar 

  51. Dundon CM, Rellini AH. More than Sexual Function: Predictors of Sexual Satisfaction in a Sample of Women Age 40–70. J Sex Med. 2010;7:896–904. https://doi.org/10.1111/j.1743-6109.2009.01557.x.

    Article  PubMed  Google Scholar 

  52. del Mar Sánchez-Fuentes M, Santos-Iglesias P, Sierra JC. A systematic review of sexual satisfaction. Int J Clin Health Psychol. 2014;14:67–75. https://doi.org/10.1016/S1697-2600(14)70038-9.

    Article  Google Scholar 

  53. Grubbs JB, Kraus SW. Pornography Use and Psychological Science: A Call for Consideration. Curr Dir Psychol Sci. 2021; 096372142097959. https://doi.org/10.1177/0963721420979594.

  54. Grubbs JB, Wright PJ, Braden AL, Wilt JA, Kraus SW. Internet pornography use and sexual motivation: A systematic review and integration. Ann Int Commun Assoc. 2019;43:117–55. https://doi.org/10.1080/23808985.2019.1584045.

    Article  Google Scholar 

  55. Grubbs JB, Hoagland KC, Lee BN, Grant JT, Davison P, Reid RC, et al. Sexual addiction 25 years on: A systematic and methodological review of empirical literature and an agenda for future research. Clin Psychol Rev. 2020;82:101925. https://doi.org/10.1016/j.cpr.2020.101925.

    Article  PubMed  Google Scholar 

  56. Peter J, Valkenburg PM. Adolescents and pornography: A review of 20 years of research. J Sex Res. 2016;53:509–31. https://doi.org/10.1080/00224499.2016.1143441.

    Article  PubMed  Google Scholar 

  57. Nelson KM, Rothman EF. Should public health professionals consider pornography a public health crisis? Am J Public Health. 2020;110:151–3. https://doi.org/10.2105/AJPH.2019.305498.

    Article  PubMed  PubMed Central  Google Scholar 

  58. Fernandez DP, Kuss DJ, Griffiths MD. Short-term abstinence effects across potential behavioral addictions: A systematic review. Clin Psychol Rev. 2020;101828. https://doi.org/10.1016/j.cpr.2020.101828.

  59. Imhoff R, Zimmer F. Men’s Reasons to Abstain from Masturbation May Not Reflect the Conviction of “reboot” Websites. Arch Sex Behav. 2020;49:1429–30. https://doi.org/10.1007/s10508-020-01722-x.

    Article  PubMed  PubMed Central  Google Scholar 

  60. Mollaioli D, Sansone A, Romanelli F, Jannini EA. Sexual Dysfunctions in the Internet Era. In: Jannini EA, Siracusano A, editors. Sexual Dysfunctions in Mentally Ill Patients. Cham: Springer International Publishing; 2018. p. 163–72. https://doi.org/10.1007/978-3-319-68306-5_15.

    Chapter  Google Scholar 

  61. Burke K, MillerMacPhee A. Constructing Pornography Addiction’s Harms in Science, News Media, and Politics. Soc Forces. 2020; soaa035. doi:https://doi.org/10.1093/sf/soaa035

  62. Thomas JN. Outsourcing moral authority: The internal secularization of evangelicals’ anti‐pornography narratives. J Sci Study Relig. 2013;52:457–75. https://doi.org/10.1111/jssr.12052.

    Article  Google Scholar 

  63. Wright PJ, Bridges AJ, Sun C, Ezzell M, Johnson JA. Personal pornography viewing and sexual satisfaction: A quadratic analysis. J Sex Marital Ther. 2017;0: 00–00. https://doi.org/10.1080/0092623X.2017.1377131.

  64. Blais-Lecours S, Vaillancourt-Morel M-P, Sabourin S, Godbout N. Cyberpornography: Time Use, Perceived Addiction, Sexual Functioning, and Sexual Satisfaction. Cyberpsychol Behav Soc Netw. 2016;19:649–55. https://doi.org/10.1089/cyber.2016.0364.

    Article  PubMed  Google Scholar 

  65. Grubbs JB, Commentary on Lewczuk, et al. Moral incongruence, disapproval and behavioral ‘addiction.’. Addiction. 2020, 2020;n/a. https://doi.org/10.1111/add.15326.

  66. Grubbs JB, Perry SL, Wilt JA, Reid RC. Pornography problems due to moral incongruence: An integrative model with a systematic review and meta-analysis. Arch Sex Behav. 2019;48:397–415. https://doi.org/10.1007/s10508-018-1248-x.

    Article  PubMed  Google Scholar 

  67. Štulhofer A, Wiessner C, Koletić G, Pietras L, Briken P. Religiosity, Perceived Effects of Pornography Use on Personal Sex Life, and Moral Incongruence: Insights from the German Health and Sexuality Survey (GeSiD). J Sex Res. 2021;0:1–11. https://doi.org/10.1080/00224499.2021.1916422.

    Article  Google Scholar 

  68. Grubbs JB, Perry SL. Moral incongruence and pornography use: A critical review and integration. J Sex Res. 2019;56:29–37. https://doi.org/10.1080/00224499.2018.1427204.

    Article  PubMed  Google Scholar 

  69. Grubbs JB, Kraus SW, Perry SL, Lewczuk K, Gola M. Moral incongruence and compulsive sexual behavior: Results from cross-sectional interactions and parallel growth curve analyses. J Abnorm Psychol. 2020;129:266–78. https://doi.org/10.1037/abn0000501.

    Article  PubMed  Google Scholar 

  70. Brand M, Antons S, Wegmann E, Potenza MN. Theoretical Assumptions on Pornography Problems Due to Moral Incongruence and Mechanisms of Addictive or Compulsive Use of Pornography: Are the Two “Conditions” as Theoretically Distinct as Suggested? Arch Sex Behav. 2019;48:417–23. https://doi.org/10.1007/s10508-018-1293-5.

    Article  PubMed  Google Scholar 

  71. Lewczuk K, Nowakowska I, Lewandowska K, Potenza MN, Gola M. Frequency of use, moral incongruence and religiosity and their relationships with self-perceived addiction to pornography, internet use, social networking and online gaming. Addiction. 2020;n/a. https://doi.org/10.1111/add.15272.

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  1. Department of Psychology, Bowling Green State University, Bowling Green, OH, 43443, USA

    K. Camille Hoagland & Joshua B. Grubbs

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Hoagland, K.C., Grubbs, J.B. Pornography Use and Holistic Sexual Functioning: a Systematic Review of Recent Research. Curr Addict Rep 8, 408–421 (2021). https://doi.org/10.1007/s40429-021-00378-4

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