Stories benefit from tension and conflict, and porn stories are still stories. Trouble is, healthy sexual relationships shouldn't have a lot of tension and conflict, so erotic stories often depict unhealthy relationships. Cheating. Noncon. Incest. Dangerous situations. Skewed power dynamics (like student with teacher, or employee with boss). Seduction of someone who doesn't want to be seduced.
It's possible to put the tension and conflict outside of the sex, and let the sex be a release from that tension. But that requires having more non-porn parts of your porn story. Whereas with fucked-up sex, you can more easily put the conflict directly into the sex scene.
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