Problem after the first orgasm
 

I am going steady with a new girl and things are great. Getting her to orgasm is fun and easy as pie. The problem I am having is that after the first orgasm she gets all mellow and is hard to arouse after that. It's not a problem for me because this usually takes 20-40 minutes depending how we choose to go about things and I'm perfectly satisfied with that. But it would be nice to continue on those days where I have the extra energy.

Any advice on how to deal with this?

Stretch it out. Could be she's just a one-time girl--nothing wrong with that, but if you've got an all-night-long session in mind, you'll have to pace yourself so she doesn't go over the edge too early.

Ask her to do you a handjob or just rest for a while so she can get aroused again.

This happens to me and I just ask her to do me a handjob. But it's also happened that she is to tired to give me hand so I just go do-it-yourself thinking about what I was just doing with her :P she can also help touching your nipples as that is not too tired.

My wife is like this. I think some women are just not multi-orgasmic immediately (whether physical or mental). I have tried different things with her but to no avail. Once she has orgasmed, it is usually at least a couple of hours before she is ready for another one. I wouldn't sweat it too much.

I personally used to feel guilty afterwards, not severely or anything, just like I'd done something wrong. I shared this with my partner who told me it was ok, that we had done nothing wrong, but I still felt that way. It was a conscience thing for me. I had no problems with getting an orgasm, and there was nothing wrong with him.

Everyone is different, ask her about it, there may be something going on inside her head.

Don't pressure her into having multiple orgasms. It sounds like she is perfectly happy having one. If she wants to explore this aspect of her sexuality in the future then that is fine but don't pressure her, it's unhealthy.