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It's like curing cancer. There're a multitude of different types, some of which can be cured, some of which can be treated, and some of which nothing can be done for.
Erectile dysfunction due to low testosterone and high prolactin secondary to a prolactinoma? You're in luck. Get surgery to remove the prolactinoma or take cabergaline to lower prolactin to acceptable levels and you'll be good to go.
Erectile dysfunction due to peripheral neuropathy? You're out of luck. There's no cure or treatment that alleviates peripheral nerve damage and there won't be for the foreseeable future. You can try viagra, but it probably won't help much.
And so on for the multitude of different causes of erectile dysfunction.