Hi, I have been with my girlfriend for 3 months. She is very sexy and I get aroused easily with just a kiss, however, when it comes to intercourse, I just go limp. She is very patient & understanding & I would love to be able to satisfy her fully. I have no problems getting an erection, just keeping it! I have been in sexual relationships before and have never had this problem- am i just nervous? I am 26, physically fit, a non-smoker, not a big drinker and have a healthy diet. Please help.