Via Madville.com, NewScientist.com: Bigger is better when it comes to the G spot. No more sexual puns please 
From the article:
The term G spot, coined by Ernest Gräfenberg in 1950, refers to an area a few centimetres up inside the vagina on the side closest to a woman's stomach (see diagram). Buried in the flesh here are the Skene's glands, the female equivalent of the prostate gland.
Researchers had seen evidence of nitric oxide activity in the clitoris before, but no one had actually looked for PDE5 enzymes or knew exactly where they might be. "It's ridiculous but true that we've waited till now to really know the female anatomy," says Jannini.
So how do you tell if you've got a G spot? Sadly, because Skene's glands are so well hidden by the surrounding tissue, no visual examination can reveal if a women has them or not. Only personal experience can do the trick.
But even for those with a small G spot or none at all, Viagra-type drugs might still have some effect, as PDE5 is found in the clitoris too. And other drugs that stimulate arousal via the brain could soon become available. But Jannini and Whipple both agree that the female orgasm is so complex that drugs alone won't work for everyone.
The even have a picture.
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