Well, for a Graphic and honest description...read on.
The feeling,with SOME women is like waving your erect penis in a warm room... !
With most women, the feeling is one of pushing my penis, into a very warm, moist, ...opening that has resiliency, and resistance, depending how firm the lips and the opening of her vagina happen to be...and the moisture level depends on how lubricated she is at the beginning...
I personally like the initial penetration of her vagina, because I like to push ALLLLLLLL the way into her with the entire length of my penis...all the way to the base...and feel her pubic hair, (if she has any) rub against my pubic hair...depending on the position she is in, with her legs and knees back against her chest and breasts...I can feel her pubic bone right above my penis and I can grind my pubis against her clitoris.
Long...slow...strokes, in and out feel the best, because I can feel the entire length and depth of her vagina and sometimes can feel the tip of my penis push against her uterus, and she tells me she can feel it too. The long strokes feel the best, because NO masturbation technique can duplicate the feeling of my entire penis being 'massaged' or rubbed in that way.
Changing to a "from the rear" position is even better, from the difference in penetration to the way I can see my penis going in and out, and the "upward' angle of the vagina in that position is a little harder to penetrate unless the penis is very stiff and firm...worth the effort.
My girl friend says" "The first time it goes in is the best feeling, with that 'beautiful'...stretched feeling I get from it...and then 'in and out' " She says that her vagina feels "stretched and burny" afterward from the friction.
For you to really know the sensation...you would have to 'own" a nice size, erect, penis, and penetrate a wet vagina...yourself...Nothing to compare it to...
Was that "GRAPHIC' and descriptive enough for you ?
Can you confirm the "stretched and Burny" feeling post-coital ?