I didn't know what to title this message, because this is a strange problem. I am a virgin (i think) and i'm 19 years old. I was ready to have sex with my girlfriend, but my erection wouldn't get hard enough to penetrate. We tried and tried, but to no avail. The strange part is, I don't have any problem when I masturbate. I love her and I wanted to make it special, but I couldn't even penetrate. I cried and she comforted me. I wanted to make sure she got some pleasure out of it, so I fingered her and gave her some oral. She also seemed to like it when I would rub my penis against her vagina. It would give me an erection, but as soon as she started guiding my penis in, it would go soft again. Does anyone know why this would happen, or how to keep it from happening? I really want to make her happy. I hope I don't get an answer telling me to see a doctor, but if I do, then I guess I will have to go and see my doctor when I have a chance. Please reply quickly.