Well it depends ;D
This is subjective thema, but if the nature made it that children go out this way and no other, it is the side effect of giving a birth. Some women exercise muscles to go back, other women go back more or less without doing anything. Other remain loose.
From my point of view, as a man - it is not my problem if a woman is loose. If I have a standard dick and woman is wide then sorry woman, do something with yourself like exercises or surgery (yes, there are women who make their pus teen-like via the surgery). I may add something from my side if I find it enjoyable enough and find time to do it. It is not that PE is suitable for anyone due to work, life style ect.
I just reject the guilt to be always on a man's hand and it was his job to fix it, thus treating women as angels without any flaws.
I am doing PE only for my personal enjoyment, not to satisfy anybody - a woman can be changed and if she expects or is used to have 10 inch cocks all time, it is her wish. I pass and find the normal one LOL
So do we need to be big? No, by no means it is a duty or what a man should do in his life.
Can we be big? Yes. We can, if we want to but not because somebody wants us to be so.