Self discipline is so much more than dealing with sexuality, but dealing with one's own is more important than worrying about another's desires. There will always be priests who have difficulty with celibacy, for the same reasons that some married men have difficulty with faithfulness. We are fallen creatures, in need of constant help from the Lord to live out our vocations.
Not so with married men...or strong married men. It's all so often that it is "another's desires" that is the only thing that will help a man deal with his own. Women have often been called a "civilizing influence" for this reason.
Just because something has gone on for centuries doesn't make it right or in need of reform. I stand by my belief that a good married man will often have more of a basis to counsel in social issues (much of which have a basis in the sexual realm) than a celibate priest.