All women have varying level of tightness. Tightness is subjective. What's tight for one person might tight (or not) for someone else.
All women start out "tight" and as she becomes more aroused and more wetter, her pussy will naturally expand. It is a sexual reflex for our pussy to expand so that we can accommodate men's sperms and to protect our pussy from being further damaged.
My bf is 7.5 x 5.75 and when he first fingers me or has sex, I am tight but as our sex session goes on, I loosen up a bit. And while I am tight, I am built to easy take bigger cocks without having to do "breaking in" or "warming up. I am able to take a girth of 7" within minutes (unlike other women who need some warming up and working to be able to take a 7" girth.)
yeah, that would take me a while to handle, but at the same time, i've only had sex three times in total. i'm far from being experienced, and i think being that i happen to be on the smaller side to begin with, sex with a larger man would always be uncomfortable to me.