Another reason that emerged that put pressure on the Church was that those church members who could manage to have kids were a treat to the established order in many kingdoms.
Although the ideal of priestly celibacy is ancient, the church didn't attempt to enforce it until the 11th century. And then it was the threat to papal power posed by those quasi-hereditary bishoprics that played a sizeable role here.
Very true.
The enforcement of the practice of celebacy was also attempt to curb 'dynasticism' within the medieval Church where positions of authority were were often passed down through family; in some cases directly from father to son. This was of course when the Church had land, power and political authority (and threats to such authority) Celibacy was not designed necessarily to curb the clergy having offspring. At least not intentionally. It was designed to remove the obligation of marriage and therefore bastardise any children a clergyman may have and null any succession rights within the Church.
Now we should all be aware that medieval Europe was not an era of prudery or restraint. Children were often 'begat' outside of marriage, but could be normalised within the family and within the family dynasty (depending on what rules of succession were adhered to - and there were many) if the child was that of a lover but the father was married to someone else. Hence the need to no only be sexually celebate, but also from marriage.
