Nothing wrong with marriage, as bourbon said. Priestly celibacy is a big subject that doesn't lend itself to quick answers...
Before turning to the history of this observance it will be convenient to deal in the first place with certain general principles involved. The law of celibacy has repeatedly been made the object of attack, especially of recent years, and it is important at the outset to correct certain prejudices thus created. Although we do not find in the New Testament any indication of celibacy being made compulsory either upon the Apostles or those whom they ordained, we have ample warrant in the language of Our Saviour, and of St. Paul for looking upon virginity as the higher call, and by inference, as the condition befitting those who are set apart for the work of the ministry. In Matt., xix, 12, Christ clearly commends those who, "for the sake of the kingdom of God", have held aloof from the married state, though He adds: "he who can accept it, let him accept it". St. Paul is even more explicit:I would that all men were even as myself; but every one hath his proper gift from God .... But I say to the unmarried and to the widows, it is good for them if they so continue, even as I.And further on:But I would have you to be without solicitude. He that is without a wife is solicitous for the things that belong to the Lord, how he may please God. But he that is with a wife, is solicitous for the things of the world, how he may please his wife: and he is divided. And the unmarried woman and the virgin thinketh on the things of the Lord, that she may be holy both in body and spirit. But she that is married thinketh on the things of this world how she may please her husband. And this I speak for your profit, not to cast a snare upon you, but for that which is decent and which may give you power to attend upon the Lord without impediment. (1 Corinthians 7:7-8 and 32-35)Further, although we grant that the motive here appealed to is in some measure utilitarian, we shall probably be justified in saying that the principle which underlies the Church's action in enforcing celibacy is not limited to this utilitarian aspect but goes even deeper. From the earliest period the Church was personified and conceived of by her disciples as the Virgin Bride and as the pure Body of Christ, or again as the Virgin Mother (parthenos meter), and it was plainly fitting that this virgin Church should be served by a virgin priesthood.
Bookmarked for response later. Thanks for your replies.