If you have suceeded with you on top, just an idea but he may have weak stomach muscles or something. I'm no expert but there are muscles involved like when a guy stops himself from peeing i dont know what its called. You need to be in reasonabe shape to thrust away for a while. It's easy for us to lie there and the old man will stand to attention. Yoga can be good for developing the right muscles like Tantric sex which can go on for hours apparntly!

He also might need too see a doctor and it never hurts to get checked out for any problems regardless of sexual history etc.
Otherwise he is lucky to have such an understanding girl and you guys should keep practicising! The more you do anything the less scary, anxiety causing it becomes. Perhaps you should do more foreplay or whatever to take the emphasis off the deed itself. This is a personal one (but no one knows in cyberland) When I was 17 I was so in love with my first proper girlfriend (childhood sweethearts) that it tooks us ages to get intimate, things were so perfect when we just kissed and stuff that we didn't want to ruin it!!
http://www.healthboards.com/ubb/redface.gif when we first did 'it' I almost didn't want to touch her she was so beautiful and I wanted everything to be right - how weird is that!.... anyway Best of luck.
Owen
[This message has been edited by DeeJay (edited 07-23-2002).]