It helps some people, hurts other people, there is no scientific backing for moderate porn viewing being negative in general.

>A 2014 article emphasizes that scientific research rarely discusses so-called “pornography addiction,” or its suggested role in ED. Yet the term is common on Internet forums and other non-clinical sources, and may even be used in treatment. This supposed link between erectile dysfunction and pornography has fueled a lucrative industry, despite there being little scientific evidence to support the link.

>Men who feel guilty about their use of pornography may struggle with ED due to this guilt. In this way, a belief that pornography is wrong or is linked to ED can become a self-fulfilling prophecy.

https://www.medicalnewstoday.com/articles/317117#porn-and-erectile-dysfunction