People seem confused by what I said about priestly celibacy two days ago, so let me try rephrasing things.
1. Priestly celibacy was a practice of the Church at the time of Jesus.
2. Mandatory celibacy became a practice of the Church hundreds of years later.
3. It is untrue to say that celibacy was invented by the Catholic Church, just because it was formally instituted long after Jesus' death.
That's the main point I'm getting at. I'm sick of people saying the Catholic Church is full of sex-hating weirdos who made up the idea of celibacy.
The truth is that celibacy was not something people made up in the Dark Ages. Celibacy has been around since the beginning of the Church. In fact, the practice of priestly celibacy existed long before the Catholic Church; it happened in the ancient Greek religious practices.
One of the commentors asked me to give Scripture passages, to back up the practice of celibacy. The best place to learn about this topic is 1 Corinthians, Chapter 7, where St. Paul contrasts married life and virginity. The general premise is "married life is good and pleasing to God, but the celibate life is better".
Now, if you prefer something that comes directly from Jesus, take Matthew 19 (specifically verses 10-12). Here, Jesus discuss people who live celibate lives, for the sake of the Kingdom of Heaven. Many translations use "being a eunuch" in place of "celibacy" for this passage. And while you're on Matthew Chapter 19, read alll the way to the end of the chapter where, again, Jesus talks about those people who give up important things (including wives) for his sake.
The best recommendation Jesus gives for priestly celibacy is the fact that he himself never married. The Virgin Mary is the second major figure of the early church who lived a life of celibacy. The other major figures include Saint John the Evangelist and Saint Paul.
People debate whether St. Joseph (the foster-father of Jesus) or St. John the Baptist were celibate. Some say that St. Joseph was a widower who had children from a previous marriage, and others say that St. John the Baptist was married to St. Mary Magdalene.