How do you increase hard erections in male?

Erections are caused by blood pooling in the penis. So if you can increase blood flow you'll get harder erections. Exercise is one of the best ways to improve your blood flow. Don't smoke, as that constricts blood flow. There are also natural herbs that can help improve blood flow to the penis. These herbs also help your body product testosterone naturally. Testosterone is a hormone that affects male sexual function. See link below for more information about which herbs are the most effective.