The anterior fornix is a zone deep in the vagina situated between the bladder and the cervix. Dr. Chua Chee Ann discovered that when this spot was stimulated it created great arousal and lubrication within the vagina which can culminate with reaching orgasm. However, climaxing through deep-spot penetration is reported as much more intense than any other form of climax and usually lasts longer as well.
From my research it seems that the anterior fornix as an erogenous zone is not well studied. The evidence is purely anecdotal with girls reporting their experienced pleasure.
My theory is that the A-spot is the ultimate tool to bring girls to orgasm from penetration alone. However, the anterior fornix is usually too deep for most smaller to average sized penises to reach. It is said that 75% of women cannot orgasm consistently from penetration alone. Only 25% of men have a penis over 6 inches long which is the ideal starting length to provide deep-spot stimulation.
What do you guys think about the anterior fornix? Could it be that this is the ultimate spot which makes every girl cum? Would this be the reason why girls prefer an above-average penis in terms of size?