Mostly from experience. The only people who don't watch porn that I have met have been women (and my Dad) haha. I remember being in college studying with this hot blonde chick in her room. And she was blabbing on about her boyfriend and something else. Making it abundantly clear that she was just letting me in her room so we could get a group project done. I sensed no possibility of romance. Anyways.... somehow the topic of porn and masturbation came up. Sound pretty random and I can't for the life of me even guess at how we got on that topic. Well she says that she doesn't masturbate. And I'm like waaaaaaa. I assumed every human being on the planet masturbated, and if you didn't you were like some kind of crazy christian person or a priest or nun.

I really didn't believe her at first and kind of poked fun at her to gauge her reaction. She was pretty freakin' adamant that she didn't. That was the first time I remember encountering someone who didn't masturbate and use porn. My ex-girlfriend also did not. And my current girlfriend doesn't (although she went to see the 50 Shades movie... lol)

I'm not trying to say that women do not look at porn. And I'm not saying that women do not suffer from porn and masturbation addiction. It is a huge problem that is crossgender. But certainly men are more drawn to it, and I think that has a lot to do with the genetic differences between men and women.

Also, the statistics support this. Ignore the 'clickbait' titles.

9% of women watch porn every day.

40% of women watch porn once a week. http://www.dailymail.co.uk/femail/article-2507752/Over-half-women-regularly-watch-porn-daring-40-admit-making-own.html

17% of women suffer from a pornography addiction http://www.washingtontimes.com/news/2010/jul/11/more-women-lured-to-pornography-addiction/?page=all

Men are 543% more likely to look at porn than females.

64% of college men and 18% of college women spend time online for Internet sex every week.

http://www.covenanteyes.com/2013/02/19/pornography-statistics/