There are some studies that claim there is a link:
- Associations Between Online Pornography Consumption and Sexual Dysfunction in Young Men: Multivariate Analysis Based on an International Web-Based Survey: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8569536/
- Is Internet Pornography Causing Sexual Dysfunctions? A Review with Clinical Reports: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5039517/
While there are others which claim there may be a weak link but still inconclusive:
- Pornography and Sexual Dysfunction: Is There Any Relationship?: https://link.springer.com/article/10.1007/s11930-023-00380-z