I have probably played with and screwed more pussy than most in my last 60 years. All pussies are as different as dicks are different. Some big, some small, some rare vaginas have an area as rough as as cats tongue when aroused , most are not .
Just inside, maybe an inch or two,
(2 -4 cm) , on the upper surface there are a series of ridges, shaped like a metal culvert. At the end of these on the inside is the “ G” spot. Named after some other perv long ago who found that women could orgasm when this area was stimulated in a certain way.
This was reported in the famous “Kinsey” book on sex.
I think everything exists in nature for a function . These ridges are more pronounced in some women than others, some do get stretched and flattened with much use ( childbirth ), years of fucking, especially bigger dicks and age. The pelvic floor muscle training “ Kegals” can keep the vag more compressed ( tighter) with pronounced ridges or not. The “ G” spot does not disappear, but does become somewhat less sensitive with age.. However the clitoris is the most sensitive part of a woman’s genitalia and if both it and the G spot are simultaneously stimulated in sex, a big “O” is most likely to happen. The clit alone can provide an “O” so knowing how to gently stimulate it with just the right touch, pressure and rhythm is good and every woman is a little different with this mix. That is why oral sex ( with an appropriately clean woman is so popular).
I believe the vaginal ridges are designed in nature to stimulate the glans of a penis and lead to the male orgasm and ejaculation .
Deeper penetration and the pressure sensation adds to this and some women like this , others find it painful.
To manually stimulate the “G” spot on a receptive woman, start with surgically scrubbed and disinfected hands, very short and polished nails ( nothing sharp) .
The middle finger works best. Lube is required either natural or applied . Gently and slowly insert the finger and feel along the top surface for the ridges.
When you get to the end, the soft pad is the “G” spot area. Go a little past and use a “ slow, gentle, beckoning “ motion from there out into the ridges. This is the way I have come to learn the nuances and sexual preference differences in women.
Patience and gentle approach to her limits of acceptance, at that moment is the key.
When and if she is ready or prefers, A penis, no matter the size is the right tool for this job. Just remember what you are doing with it in any position.
A good, thinnest possible condom doesn’t take a lot away from the mutual pleasure if the technique is good.