If a woman can't have children as she had her womb removed or her tubes severed which means that she will not "conceal what Allah has created in their wombs if they believe in Allah and the Last Day. ..." (Qur'an 2:228)
Since the whole aim was to make sure, if there is a child, that there is no confusion as to who's child it is....
So woman have procedures done that ensures that the can never fall pregnant again.... And we have DNA testing...
Why should the woman do iddah?
Men, what is the requirements on them after a talaq and how soon after a talaq are they allowed to remarry?