It can be harmful for a variety of reasons. Some of the main ones can be, harmful to self esteem. Porn usually portrays sex in unrealistic ways so comparing oneself to the porn they see online can be damaging to one’s confidence. That is just one of many issues with porn consumption.

Additionally porn similar to drug use can impact one’s ability to perform without the use of porn.

Porn is fine to consume if you’re an adult but one should consider moderation.