It has not and you'd know that if you knew church history.  Celibacy of the secular ordained priesthood developed over the first 1000 years of church history.  There were 2 primary historical reasons for its emergence:
1.  If a man had no heirs, he could not bequeath his benefice to a son.   A man could not under church law claim a legitimate heir if he was not married.  Very simple & fairly effective way to ensure that property remains under the control of the church.  
2.  If a secular priest--ordained locally for his diocese--appears to be a "religious" he has more prestige and influence with the ignorant laity who can't tell the difference.  So secular ordained were made to resemble them in lifestyle and bearing as much as possible without the special education, while keeping them firmly under the control of the local bishop.  Thus celibacy & some special modes of dress.  
These are actually still in place, and many ignorant parishioners still cannot tell the difference.