In this article https://m.huffpost.com/us/entry/5963460 it says that men are 543% more likely to view porn than women.

I think this is directly because of the situation modern man finds himself.

To explain, males in ancient times (cavemen) did not encounter women anywhere near as much as we do in modern times. When cavemen encountered a women, the urge to procreate was incredibly intense between the two. This meant that when a caveman encountered a cavewoman, sex would more times than not ensue. Our primal brains were accustomed and expected sex to happen in these situations. The sexual fulfillment was extremely intense.

Now let’s go forward in time to modern man-woman interactions. Women find only 20% of men attractive(what the fuck). They now have the choice to pick and choose who they have sex with. They dress oozing sex appeal, but deny the large majority of men. By dressing with sex appeal they bring out the primal urges within men. These primal urges go largely unsatisfied and result in extreme frustration. This frustration leads to extreme amounts of porn.

TLDR; Since women refuse to satisfy, men go for the next best thing in search of fulfillment.