In comparison to couples who never viewed porn, a 2011 study found that those who watched porn alone reported twice the rate of cheating, and individuals who viewed porn alone and with their partners reported three times the rate of cheating.
(Maddox, Rhoades, & Markman, 2011)
- Maddox, A. M., Rhoades, G. K., & Markman, H. J. (2011). Viewing sexually-explicit materials alone or together: Associations with relationship quality. Archives of sexual behavior, 40(2), 441–448. https://doi.org/10.1007/s10508-009-9585-4