I'm not sure that you would call it pressure. I started using viagra because I had SPS(shy penis syndrom) :rollseyes on a couple first time meets and it was really an ego killer. Sometimes the mind is willing but the body just wont cooperate. I'm not worried about cumming more than once in a session, I dont have a problem with control, it was just the fact of making things work when you wanted them too. How much of it is the actual drug, and how much of it is mental, i'm not sure, but it seems to work.