[Hemingway's Ghost]

My sister-in-law just lost her marriage to porn. Her husband seemed incapable of telling the truth about anything.

Another way to look at it, perhaps, is that your sister-in-law didn't lose her marriage to "porn," but lost her marriage because the person she chose to marry was a liar.

[butterdezillion]

A person can try to figure out which came first, the lying or the porn, but it seems to be a pattern that the 2 go hand-in-hand.