--small fiber neuropathy and autonomic neuropathy, especially that linked to circulatory or ischemic causes (diabetes and certain autoimmunities come immediately to mind) can certainly have effects in that area, resulting in erectile dysfunction, ejaculatory dysfunction, and reduced sensation . . .

The treatment for this is pretty much the same as the treatment for neuropathy overall--healthy lifestyle, blood sugar control, supplements, exercise to tolerance, etc., to try to arrest the circulatory breakdowns. If autoimmunity is involved, immune modulators may result in some improvement. I'm wary of a lot of the "treatments" that are more specific, even the erectile dysfunction meds, as they are systemic enough to have other side effects, and don't address the underlying problem.

Anyone with problems in that area should also be investigated for specific compressive problems in the pudendal nerve area and lower spine, as well.