I had an incredible amount of difficulty with this issue myself, and know that it is a very common and serious issue with others as well.
From what I've learned, it depends very much on the woman in question. Each person has their own unique mind, heart, and BODY, and that's not only true of male bodies and hearts and minds, but FEMALE ones as well.
And ALL of those "features" and interests are subject to change over the course of time as well as maturity.
Younger ladies tend to have a smaller, more constricted and possibly more sensitive or tender vagina as well as their overall reproductive system. As their bodies change with age and childbearing and other factors, those things can often change to a large degree as well.
Also, I think a woman's body tends to respond very much to the sexual arousal and stimulation as well as the emotional connection and mental gymnastics or rest that she is having at the time of sexual activity.
In other words, in my own wife's case, her degree of perceived "fullness" has a LOT to do with how excited I get her physically and mentally and how enjoyable the overall experience is for her at the time, because her girly parts "embrace the moment" or "shrink to fit" whatever's giving her that loving feeling whether it's my fingers or other appendages or toys.
Her first AP was in fact bigger than me and also got her to fairly quickly orgasm the very first time as I understand it. But he also hurt her and she had to really control and run the show to keep him from going on too far/deep because otherwise it just hurt way too much. This did not make him happy to have to hold back compared to the sex he was regularly having with his other side piece chick who wasn't as small as my wife was/is on the inside.
Consequently, not only was she never able to really just relax and enjoy it like she can with me if she wants to, but also she gets way BETTER sex in general and much more variety and fun and options at her discretion and mine than she ever could have with him, since she doesn't always like to be the one doing most of the "driving" or to also have to keep one foot on the brakes the whole time to keep certain "things" from going too damn far and ruining the experience for us both.
But it totally sucks to have another man's shit to deal with in my own head and bed and wife, I know.
Here's a PG-13-ish clip from a mainstream movie called Full Metal Jacket (the full movie itself is rated R, however)) thatonds what we are saying on here, btw.
The video quality is poor, but I didn't want the better quality one that had additional discriminatory slurs in it (besides the prostitute's "discrimination" based on SIZE, that is).
Too Beaucoup (Too Big/too much) aka Size Matters
https://youtu.be/-AkB5qi1r4Q
[This message edited by Cephastion at 2:52 PM, January 23rd (Wednesday)]