It could metter... too big can be uncomfortable, too small probably cause less pleasure, but it depands on lots of things...
but if you be with the right person it never mind...!!!!
Most of men got between the two value..
Bigger one should spend lot of time with the worming up, and streching patiently and it can be good too.
Smaller one can use toys, or fingers, or tongue, and anithing else what can a girl enjoy, and it could be such good.
In our relationship (threesome) my gilrfriend got a bigger lover. She feels differnt way but not couse more pleasure.
With bigger she got usually vaginal orgams, and she can repeat it more times, end she enjoy the feeling be full, and fuck for 1-1,5 ours, but usually not better for her, just enjoy it too!
With me(smaller) she got usually clitoral orgasm, and we fuck between 20-40 minutes and she got a very intensive orgasm, and she have to rest after it. (but sometimes vaginal too but i only have to "work" harder with the right technic)
So both of us can satisfy her really only different way.
We think size problem probably in mens mind...