Men with diabetes can be at a significantly higher risk for Erectile Dysfunction than non-diabetic men. This is due to the damages to nerves and blood vessels in diabetes conditions.
https://care.diabetesjournals.org/content/25/8/1458
https://www.mayoclinic.org/diseases-conditions/erectile-dysfunction/in-depth/erectile-dysfunction/art-20043927
Diabetes drugs can sometimes cause side effects or may not mix well with other medicines you take and you experience symptoms like upset stomach, B12 deficiency, unusual weakness, tiredness, sleepiness, breathing difficulties, muscle pain, urinary tract infections, yeast infections or a serious condition called lactic acidosis.
Some drugs can raise the chances of having heart problems and an increase in blood markers of a stressed liver. The most common side effect of insulin therapy is low blood sugar. You may also have headaches, rashes, dizziness, anxiety, cough, and dry mouth.
https://www.webmd.com/diabetes/diabetes-drugs-side-effects-interactions
Long-term complications of diabetes develop gradually. The longer you have uncontrolled diabetes —the higher the risk of complications.
The serious complications of having long term diabetes include heart blocks, heart attacks, nerve damage (neuropathy), Kidney damage, retinopathy, foot damage, skin infections, hearing impairment, Alzheimer’s disease and depression.
https://www.mayoclinic.org/diseases-conditions/diabetes/symptoms-causes/syc-20371444