So, that's a tricky question for a couple reasons. For one, the whole framework of "erectile dysfunction" is a bit iffy, simply because there's no right amount of times anyone is supposed to become erect, nor any universal "right" conditions. Erections -- when they happen, how, how often, in what circumstances, how long they stick around -- is diverse. That framework suggests differently. Get what I'm saying?
Porn in something that people also have diverse relationships with, and that doesn't have a unilateral effect on everyone's sexual response or any other part of their sexuality. By all means, some people find it is something that has negative impacts for them, just like some people find the opposite, and loads of people are somewhere in between.
Never doubt that a small group of thoughtful, committed citizens can change the world. Indeed, it is the only thing that ever has. - Margaret Mead