G-Spot
This Spot, also called G-Zone, is located at the upper vaginal wall. Since every female body is unique, the zone is sometimes closer to the vaginal opening or hidden deeper near the cervix. The discoverer, Dr. Gräfenberg, spoke of an "erogenous zone in the anterior vaginal wall, along the urethra, which swells in sexual stimulation". [1] New research results localize the female prostata there. For many women, pressing the G-point can be very pleasant, some even ejaculate. [2] [3] [FEMALE PROSTATE]

A-Spot
The A-Spot (Anterior Fornix Erogenous Zone) was first introduced by the Malayan gynecologist Chua Chee in 2003 at the Asian Congress of Sexology.

The point is located at the upper vaginal wall, between the G-Point and the cervix. According to gynecologists, the A-Point is very sensitive, even more than the G-Point. When stimulated, the vagina has a higher and faster lubrication and a third of women experience multiple orgasms. [4] [5]

Dr. Chua Chee explains in an interview why a fast and efficient lubrication is important for women:

„A woman can be a good wife, a good mother, a good daughter-in-law. But this is not good enough. If she does not perform well in bed, she could be kicked out of the matrimonial home by her husband. This is a terrible price to pay for poor sexual performance." [5]

Further Links: 
EXTERIOR VIEW - POINTS OF INTERESTS