You shameless promoter you! I oughta slap you with my happy stick, i'm so happy.
Yea boy's it called the anterior fornix erotic zone and is located at the back of the vaginal canal close to the cervix on the lower wall. The zone is roughly 1-3 wide and doubly long. If you can get something back there it's hard to miss. Generally speaking it's about 6 inches in and considering that the average man has a penis length of 5.88 inches if he thrusts wide he'll hit it.
It can be stimulated other way's too however, dildos and similar toys are an obvious choice, if she can stand it you can do so by hand or you can enter her from behind anally, when penetrating anally aim for her belly button, the movement will massage the back of the A-Spot, recent studies project that it is this that delivers most of the pleasure women feel during anal sexand explains why it is possible to orgasm during anal sex. Previously it was believed that the pleasure was dervived ONLY from the nerve endings around the anus and those that can be stimulated internally with force or along thin tissue.
Cheers. Glad i could be of help.
My Name Is Vincent Chase.