Problems with penis malfunction are no laughing matter, and sometimes they are a symptom of an underlying health problem. One such condition, which affects both a man's physical and sexual health, is type 2 diabetes. It is extremely important for men with diabetes to manage the condition, as out of control blood sugar can be quite detrimental below the belt. It is also a good idea to practice daily penis health care, even in the absence of physical illness, as part of a man's general health and wellness regimen.