Wrong technique and poor stool habit can make it worse. Mens rush videos rarely do anal stretching scenes before penetration (unlike hunk ch and coat) i think that's the main cause. Asuka took more dick than yukiya did and his hole doesn't seem that bad, he even work as an escort.
I know some western porn act like having that "rosebud" hole is a fetish for some people, but i'm curious do people really like that? I see it as a medical condition that needs treatment

yukiya's hole wasn't that bad but some of the pictures i found on the internet are really concerning