I started out with a max NBP length of 7” and I can’t remember not touching bottom with any of the 20+ women I got with while at that length and I’ve been with women from 4’10”-6.0’.
In my experience really tiny women do tend to be more shallow and tall women and average height women seem mostly similar, tall women may tend to be slightly deeper but if so it’s minor.
It’s really just physiology, I would assume that on average if you took ten 6.0” women and ten 4”10 women the tall women would tend to be a little deeper.
I’ve seen all shapes and sizes be tight or loose and can’t really draw a distinction there and that’s probably more so do to muscle tone and strength than body shape.
The cervix I would say is usually around
6.25-6.5 inches deep but it moves during their cycle, it’s usually more out of the way while they’re ovulating. It feels kinda hard and even pointy and bone like sometimes. I try to always avoid hitting it as it usually hurts them and sometimes me too.
The cul de sac feels soft and good. Some women I’d say maybe 20% love it when you can put a little pressure and stretch it and others are just indifferent. It also seems like the women with deeper vaginas like the bottom stretched out more than the women with shallow ones but that’s just my experience.
So at 7 NBP I could always touch it but sometimes just barely. After I got up to 7.25 NBP I could usually not just touch it but touch and then push and stretch it some. At 7.5-7.75 NBP I’ve ran into small shallow women and bottomed them out with an inch or more still left out in the cold while in missionary.
So anything much more than 7.25 NBP will usually be extra for most and longer than optimal for the ones who don’t like the cul de sac pushed.
Also the more you stretch them and the more turned on they are and after they’ve came a bunch they can accommodate more.
I hope this answers your questions.