My wife gets very aroused. She is the wettest and most open (dimensionally) woman I have ever been with. I still remember the first time I went down her pants and thinking wtf! I was hooked from then on.
Shit, what were we talking about? Oh yeah, the end of the rainbow!
I think at 7.25” I am sliding to and in some positions past the cervix, which I can feel rubbing the head of my cock. I am now starting to feel back pressure from what I believe to be the posterior fornix, when in our favorite position, doggie. She enjoys hard and deep penetration, she also to this day, everyday, gets very aroused.
Bottom line is all women are different and level of arousal can make the difference between pain, pleasure and the shape within the vagina.
I would think once you begin to cross 7” bpel the potential for causing cervix pain and /or reaching the fornices becomes a greater possibility. I think if you want to really hit the wall in the majority of women (assuming arousal) probably =>7.5” is required.
The trade off is that some women might not like depth and just simply prefer an average cock length that stays clear of the cervix and the fornices. They might appreciate the fornices, but simply are too sensitive in the cervix to relax and allow themselves to adapt and acclimate. I suspect with the right lover, a slow and conscientious lover, she could learn to enjoy.
I have grown into my wife and she slowly adapts to my growth during our daily sex, it’s the perfect storm for PE growth.
I rounded up, voted 8”.