question: Hi there, I have ED and have been on viagra for 10+ years. From time to time , once in a blue moon I will take one and not able to maintain an erection. this evening be one of those times, when my partner and I was going to sex and I could not maintain an erection even after taking a viagra pill 30-45minutes prior. Now he thinks I have been cheating on him. I dont know where to turn or what more I can do so he understands more. Scott