Ok I would like to share my experience.
I had sex with my wife. She said that my penis is bigger but I told her that I Guarantee that it is not.
I am measuring my penis, its always the same. She says, it feels it bigger.
Can someone explain?
Yep. It's very simple explanation actually. I'll take myself as an example.
In the vaginal lining, the nerve concentration is more than the penile nerve branches covering our entire shaft. The vaginal nerves are more concentrated in the clitoris, but the same branches are covered all over the inner wall. When we perform our PE, we think only about the sizes in girth and length that force the vagina to feel full or to push it past the limit. That's not true. As I mentioned many times before, even if your penis increased by just 0.5cm in girth, they will notice. Length, not so much. Why? When the vaginal wall tightens down during arousal, the nerve branches come into contact with the shaft, while the clitoris is also being stimulated at the same time. The signal sent from each stroke is literally calculated by the brain. Any extra dimension, be the girth or length, is taking into account as the vaginal wall attempts to extract the semen from the male's sexual organ by providing any additional stimulation to excite him.
In PE, you have to account for more than just the width and length of your penis. You need to keep in mind the EQ quality as well. The vagina wall detects either the more solid or softer feel of the penis, and fasten itself based on the needs for the stimulation required. This is talked about so much in biological evolution that I got sick and tired of hearing the new researches published the data as half the rediscovered info. But what you gents don't realize that during a female' hyper-excitement, her vaginal wall tighten up to the maximum and the cervix pushes down closer to the penile glans automatically so the cervix can receive the semen in the collective pool. We recognize this area is the end of the vaginal wall, or bottoming. But in reality, it's just a collection pool for the cervix to dip into so it can pull up the semen. During this period, the female's brain can sense and calculate every little millimeter of your penile size, be the length or girth. It can even tell the bulging vein and the pulsation of the penis when it's ready to ejaculate.
So, for her to say, "it feels it's bigger", she's not wrong. She probably sense your EQ improved, the penetration stimulation is harder, and overall feeling of being "larger", on top of the increased size.