The more you know!
So, the parasympathetic branch of the autonomic nervous system is responsible for producing a penile erection (or vaginal lubrication) in response to stimulation.
This means that if there is a problem with this part of the autonomic nervous system, one might experience erectile dysfunction, and that would be a form of dysautonomia.
Specifically, autonomic nerves stimulate the endothelial cells of blood vessels in the penis to produce nitric oxide (NO), which causes the blood vessels to dilate, greatly increasing blood volume in the penis.
Of course, people love to attribute other causes to erectile dysfunction, especially psychological ones...
Besides dysautonomia, a problem with the endothelial cell production of nitric oxide could also cause erectile dysfunction, and this would be a form of endothelial dysfunction.
Hormonal disruptions such as testosterone deficiency or excessive prolactin, which could be related to hypothalamic dysfunction, can also lead to erectile dysfunction as these hormones affect the autonomic nervous system.