Hi i am 28 years boy and first time I am in relationship with a girl but I have a problem that when I was with her and trying to sex with her then I takes much time to finish and my penis get hard at the bottom and skin of upside get hard and I takes a lot of time in finish around 3 hour n which z irritating both of us n get pain to her but after first time done second time I takes less time than before. I just want to know is it normal or I have any problem. Please consult me properly and help me out from this problem.