Researchers have used surveys, imaging scans and biopsies of women, all trying to locate and define the presumably orgasmic area on the vaginal wall known as the G-spot. Based on a review of 96 published studies, an Israeli and American research team came to one conclusion.

“Without a doubt, a discreet anatomic entity called the G-spot does not exist,” said Dr. Amichai Kilchevsky, a urology resident at Yale-New Haven Hospital in Connecticut, and lead author of the review, published Jan. 12 in the Journal of Sexual Medicine.
[…]
“I think that the bulk of the evidence shows that the G-spot is not a particular thing. It’s not like saying, ‘What is the thyroid gland?'” Komisaruk said. “The G-spot is more of a thing like New York City is a thing. It’s a region, it’s a convergence of many different structures.”
[…]
“We don’t even have orgasm all figured out yet, I don’t why we would expect to have the G-spot figured out,” Herbenick said.

There you have it, men. Tell her the G-spot is like New York City and you’re a cab driver who can’t speak English well enough to know how to get her to her desired destination. Or learn how to ride a unicycle. Uh… No idea where I’m going with this…