Specialization in medicine has upsides. It allows you to see an expert who focuses solely on the body part or ailment that's beleaguering you. These doctors may be cardiologists, urologists, endocrinologists or other specialists.

In the case of heart health and penis health, and how they're connected, cardiologists' core mission—to keep you alive—comes first, according to Petar Bajic, M.D., a member of the American Urological Association and a urologist at the Cleveland Clinic.

"A lot of times when a man goes to see a cardiologist, it's just about making sure the heart is healthy, making sure that blood pressure is low [and] minimizing the risk of cardiovascular disease, which is the most common cause of death in men," Bajic said.

That's good, right?

Sure, because being dead is worse than being flaccid. But heart patients may not realize they should talk to their cardiologists about erectile dysfunction (ED), for example.

Bajic and Niels V