Q: What type of natural vitamins or substances can ensure a hard erection in lieu of using Viagra? I want to keep a hard on for an hour or more every time I have sex and so does my wife.
Dr. Klein: There are no natural substitutes for Viagra, which acts on the hormones that control when an erection goes down. But very few men keep their erections for an hour, and it can be a mistake to focus too much on this. Enjoy whatever you two do together, erection or not.