Hitting the g-spot

I want to try fingering my girl friend some time soon and I want to make it as pleasurable as possible for her. I've heard that I can massage her G-spot while licking her clit and that will drive her absolutely nuts with pleasure.

How do I find the g spot, apparently it's about 2 inches into the vagina and on the upper wall. Will it be obvious when I hit it, like does it feel different or will she immediately react?

Also about how long will it take for her to have an explosive orgasm after I start? 5 minutes, 10 minutes? longer?

Thanks

>>24 I see what you mean, but I never meant that women having orgasms was a myth.  And I may have not gotten my point acrossed correctly, but basically, the easiest way to please a girl is to LISTEN and PAY attention to her body language.  Moaning can make you think she likes it, but if she's pulling away....she's not into it.  Some girls will fake for various reasons, but if it's a young girl, you're right, she's very impressionable, so she might be under the impression that sex is just what all boys want and she might not think of doing things to enjoy herself. 

Women don't tend to enjoy sex until they are older, and I mean FULLY enjoy, not just being an attention whore.  Theres a difference in being fucked, and fucking. 

It may be because women don't get into their prime until they're older, but it could also be because they're under the impression to just give in and sleep with a guy because it's the cool thing, not because she enjoys it.  I'm not saying it's right, I think it's completely fucked up, but that's how I viewed sex for a long time.  Until I found someone who would pay attention to my body, I never had a guy give me a good orgasm that I didn't help with in some way or another.  Take my advice for what you want, I don't care, but I hope this kid does well, because I think it's awesome he wants to get his girlfriend off and NOT just himself. 

And yes, they are impressionable, but we can't come right out and say, 'do this, this, then this and you'll make your woman come in no time' or we'll be setting him up for failure.  He needs to understand that, just like he likes different things, so will she, but she'll probably be more shy about expressing what she likes or doesn't, and that's where listening and paying attention come into play.