I wondered about length a whole lot over the years. I can tell you that most women’s vaginas measure 6” to 7” deep, when measured with a rigid glass dildo. That’s including the lips. I’ve searched for info about the depth of the vagina over the years. From what I’ve read, most women are average. A rough estimate of the distribution would be that 10% are shallower, and maybe 20% are deeper than average. Only a small minority are 8” to 9” deep. My current girlfriend is 7” to 7.25” max.
She could take more that 7” of a live flexible penis. I’m sure of that. My length is 6.75” bpel, and the only time that I bottom out is when she is on top and angles her pelvis perfectly, and sits as low down as she can, and smashes down on me. I have to have a very hard erection too, otherwise I don’t hit bottom (or feel the upper end of her vagina).
I’d need another inch to be able to hit bottom consistently in missionary.
Struggling with a peyronies injury during sex and loss of size after having been into PE.