Men's Physiological Structure

I just happened to watch a documentary about human sexuality last night. It was mentioned, that during sleep a man has several erections, which are supposed to keep the blood vessels in the penis healthy. If, for some reason (and here I had the image of a chastity belt in my mind) these erections are prevented, the long term effect can be lessened blood flow to the penis, resulting in smaller erections and finally impotence. I guess that is worth knowing, as most people wearing a chastity belt do not want to lose their sexual performance…