Most women who have experienced both claim that it is easier to have multiple G-spot orgasms than it is to have multiple clitoral orgasms. If an orgasm rears its lovely head while you two are playing, try whispering some words of encouragement (and perhaps ratchet up the intensity just a little bit), but basically continue pleasuring through her orgasm, afterwards, and possibly into a next one.
As long as it still feels good for both of you, what's the point of stopping? There is often a "pyramid effect" with multiple G-spot orgasms; each one makes the next one feel better, and makes almost anything else sexual feel better too. However, as I said earlier everybody is a little different, and quality is obviously more important than quantity.
It IS true for some women that G-Spot play may become more likely to result in orgasm over a period of weeks or months after first starting to experiment with it. It is also true that the intensity of G-Spot orgasms may be directly related to pubococcygeal muscle tone, which is another incentive for doing regular PC muscle exercises.
If you're a woman and you want to try including your G-Spot when masturbating, one good combination of toys would be a vibrator (used on your clit as you're getting warmed up).
By the way, in general it isn't a good idea to have a huge ego/emotional stake in having (or "giving") orgasms or multiple orgasms; most sex educators believe it isn't helpful to get "goal oriented" about something that's supposed to be fun.
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