If I have diabetes will testosterone help me with my sexual response?

Yes, in most cases it will. It also increases insulin sensitivity which can decrease triglycerides and stabilize blood glucose. It can improve the overall status of your diabetes. In men who have had many years of diabetes—especially without good control—the blood vessels in the pelvis are affected and might not provide enough blood to the penis for an effective erection. In these cases, other medication designed to improve penile blood flow might be required.