The Sixth Commandment is clear — there is a universal call to chastity, and no one is exempt. There is a line in the Acts of the Apostles that I once found humorous: So the word of God continued to spread, and the number of disciples in Jerusalem continued to grow rapidly. Even a large number of priests became obedient to the faith. (Acts 6:7) Of course the priests referred to here are the priests of the ancient Temple, the Levitical priests. In the past, such a line seemed ironically funny to the average Catholic who heard it. But that...