Only one time in my exploits I was with an older Filipino lady and my penis hit bottom and I was only half way in. I was surprised that it didn't hurt her at all.
I'm 7-1/2 inches and most of the girls I've been inside of have asked me not to go all the way in because they are feeling some discomfort, apart from this one girl who liked to be pounded hard even though I could feel I bottomed out.
I'm 7 inches and curved up. Depending on position I've found most partners take me full. But some I find its at their limit. All are different. My wife likes 10 inch toys plus. I've been with a few who couldn't take me.
Average depth of unstimulated female vagina is about 4 inches. Normally the vagina can stretch to about double the length. So an average vagina can accommodate an 8 inch penis before the cervix is reached. Again, the average penis size is about 5.5 to 6.5 inches. Therefore, for most of the people, the penis won't make contact with the cervical opening but lies very close to it.