(and YES, the post was written by a woman, a mother and a wife, so she probably knows a thing or two about the topic at hands)
"5. Say no to pornography.
Whether it’s watching lewd videos when no one’s around or reading erotic romance, porn will not improve your sex life—it will destroy it. It causes hurt and shame, and other psychological issues that lead to a lack of performance in the bedroom.
And although this has historically been a bigger issue for men, statistics show that this is an increasing problem for women. No one should have to compete with a porn star or fictional character for the attention or desire of their spouse."
Well, it's my wife who brought the most porn videos when we moved together, it always spiced up our sex life, and I never felt threatened by the fact that three of those videos were featuring Ron Jeremy. Nor did I had to compete with him to get her attention or desire.
It also haven't slowed down our sex life. It was more the opposite, and sentences like, "oh, we have done this position in a while", and other, "oh, why not try this one ?", weren't infrequent.
When done in a sane way, therefore not in secret behind your partner's back, and of course with mutual consent, porn improve your sex life, especially after years of life together. Not necessarily by spicing things, but by breaking the routine every couple end stuck in.
After years, you tend to do sex in a mechanical way, because you want to bring her pleasure, and you know that "this" works every time. Watching porn remind you that there's other moves, other positions, that the ones you now master to the perfection, and those moves and positions are more pleasurable, precisely because recently unusual.
If one feel in competition with the porn stars in the movie, there's a bigger issue in the couple than the fact that one watch porn.