Gee - spot ( definition ) - several people in the world probably has heard of this delightful thing. It is located inside a woman's body.
Calling any part of the body by a single letter can be unfair. Why not call it by any other consonant? What's wrong with F? Or Q? Come to think of it, what's wrong with the vowels? Calling that part the " Gee - Spot " could be discriminatory and against Alphabetical rights.
but seriously for educating purposes, I think it was named after Ernest Graefenberg-the german guy who discovered it around 1950.
Now, another question, is it really true?? again it depends, some women have bigger g, some have small g, so it`s not a guarantee of ultimate satisfaction