If erectial dysfunction is just caused by circullation being cut can it be cured?

Yes it can, that is why they tell diabetics who have to much sugar in their blood to get diet under control etc...because it will aid taking away the blockage of the arteries that cause s. Smoking, drinking and over eating are three most common causes of erectile dysfunction and all three can be controlled. There are also medications that aid in opening the vessels so blood can enter due to dilation, i.e. Viagra. This is symptomatic treatment, not a cure.