when i lost my virginity, the girl i was with was not a virgin, though we were in a serious relationship. ill be honest-it didnt go too well. i lasted about 2 minutes
but she was great about it, and after another couple somewhat awkward encounters, we started having a solid sex life.
girls, keep in mind that us guys are just as nervous the first time as you. perhaps more so, because the performance anxiety factor is definitely a bigger factor for us. a couple of my friends couldn't even get it up when they went to do it the first time (so ive been told; im also told this is not uncommon). our first time, we feel the pressing need to be ron jeremy. also, if you're not a virgin and he is, he's going to feel pressure to measure up, which will make the performance anxiety worse.
guys, just relax. seriously. she's not expecting multiple mind-blowing orgasms from you the first time you have intercourse. be honest with her. its ok that she knows you're nervous. you will be pleasantly surprised, amazed even, at how understanding and supportive girls can be, especially if you're in a comitted relationship. i know my girl was. if you have issues the first few times, dont worry, its totally natural