I was more disagreeing with the idea that clitoral orgasms are somehow more right than vaginal/g-spot orgasms. In your post, you said clitoral orgasms are the "true" orgasm--which isn't correct, because any orgasm is "true" to the person having it. The idea that any orgasm from a certain location is better than another is something Freud focused on (though his argument was that vaginal orgasms were superior to clitoral orgasms, because clitoral orgasms were somehow childish or selfish), but regardless of how the orgasm originates, it's no or less legitimate than any other way. And to distinguish between the two is truly pointless, because, as you suggested, all the nerves in the pelvic region are interconnected. I believe I misinterpreted your initial post.
As for the physiology involved--in PSY 202 this spring we covered sexual physiology, as well as in my WS 399 class, and both classes proposed that the g-spot actually consists of the root nerves of the clitoris. Digging around for evidence (because I hate to spout off without backing evidence), I found this:
Quote:
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Masters and Johnson were the first to determine that the clitoral structures surround and extend along the vagina, determining that all orgasms are of clitoral origin. [6] More recently, Australian urologist Dr. Helen O'Connell using MRI technology noted that direct relationship between the legs or roots of the clitoris and the erectile tissue of the clitoral bulbs and corpora, and the distal urethra and vagina. [7]She asserts that this interconnected relationship is the physiological explanation for the G-spot and experience of vaginal orgasm taking into account the stimulation of the internal parts of the clitoris during vaginal penetration.
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from:
http://en.wikipedia.org/wiki/Clitoris
This basically sums up O'Connell's findings--the paper can be found on PubMed if you're interested.