"Of all the activities on the internet, porn has the most potential to become addictive," reports Gary Wilson, quoting a Dutch Study on the topic.  And, do you know why it's so hard to do research on internet porn use?  Because it's use is so common they can't find adult males who haven't been exposed to internet porn!  But the downside potential of addiction is very real, and it (like so many other things) has to do with brain chemistry and (you guessed it) dopamine and the brain's reward system  Wilson does a good job of providing the details in this TedX Talk.  My thanks to Nancie Kohlenberger for sending it to my attention.

If you want more on porn, go to this very popular post - 9 Reasons Why Porn Hurts.