plenty of recent studies show that pornography use is manifestly harmful to our brains, especially developing brains. Cursory searching yielded these articles, but there are many studies to be found.

http://yournewswire.com/this-is-how-pornography-addiction-is...

http://www.dailymail.co.uk/sciencetech/article-2642712/Does-...

https://www.menshealth.com/sex-women/porn-debate/

Pornography is a harmful drug and can have many of the same psychological and physiological effects as other addictive substances.