I have found online pharmacies selling Viagra and sorted them by price to help you achieve longer and harder erections during sex. So he took another and that was a mistake! A man who is depressed or worried about his performance during sex may not be as rigid or may require more direct stimulation to be achieved. In the penis relax and widen - which allows more blood to flow through the cardiovascular system into the genital area. So it will not increase the response of erectile dysfunction drugs.