Porn isn’t just an issue Catholics deal with. This can apply to any Christian.
Not only "any Christian" but "any human being."
Too long a story to relate here, but I once had a long, thoughtful discussion with a thoroughly secular agnostic man about porn vs purity of heart.
It began with his question to me, "Hey, you're a Catholic, so..." but it ended up with an agreement that if you don't want to objectify women, you shouldn't immerse yourself in sexually compelling images of objectified women.
He was sincerely interested in, shall we say, the human or "humane", social/psychological/ethical aspect, because he really didn't want to demean women or demean himself. I absolutely respected him for that.