The woman's body actually changes during intercourse with a well hung Man. As her excitement increases and his large Manhood continues to penetrate her.. her uterus shifts up inside her body slightly. This opens a channel and access for him to go deeper. A cuckold can actually see when this happens. The Man that perhaps was only able to comfortably be half way in, can now enter completely. Her passion and excitement increases drastically.. the cuckold will often see her eyes role back in her head. Her moans deepening.. her awareness of anything or anyone dissappears.
that’s a great way to describe the posterior fornix