Erectile dysfunction (ED) is defined as persistent difficulty achieving and maintaining an erection sufficient to have sex. Causes are usually medical but can also be psychological. Organic causes are usually the result of an underlying medical condition affecting the blood vessels or nerves supplying the penis. This problem can be cured with various options. Dr. Raj  is an expert in sexual regenerative medicine. He is board certified in both Urology and Anti-Agin Medicine. visit our website for more info.