Or Chekhov's wrapped disposable razor! 
This is the relevant bit in the novel, which I read after I saw the film, so can't remember exactly what was changed in the film:
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‘And what would it have been, this treatment?’
BenÃtez sighed. ‘I believe the clinical terms are surgery to correct a fusion of the labia majora and minora, and a clitoropexy.’
Lomeli sat down on the nearest chair and put his head in his hands. After a few moments, he was aware of BenÃtez pulling up a chair next to him.
‘Let me tell you how it was, Dean,’ BenÃtez said softly. ‘This is the truth of it. I was born to very poor parents in the Philippines, in a place where boys are more prized than girls – a preference I fear is still the case all over the world. My deformity, if that is what we must call it, was such that it was perfectly easy and natural for me to pass as a boy. My parents believed that I was a boy. I believed that I was a boy. And because the life of the seminary is a modest one, as you know well, with an aversion to the uncovering of the body, I had no reason to suspect otherwise, and nor did anyone else. I need hardly add that all my life I have observed my vows of chastity.’
‘And you really never guessed? In sixty years?’
‘No, never. Now, of course, when I look back, I can see that my ministry as a priest, which was mainly among women who were suffering in some way, was probably an unconscious reflection of my natural state. But I had no idea of it at the time. When I was injured in the explosion in Baghdad, I went to a hospital, and only then was I fully examined by a doctor for the first time. The instant the medical facts were explained to me, naturally I was appalled. Such darkness came upon me! It seemed to me that my entire life had been lived in a state of mortal sin. I offered my resignation to the Holy Father, without giving him the reasons. He invited me to Rome to discuss it and sought to dissuade me.’
‘And did you tell him the reasons for your resignation?’
‘In the end, yes, I had to.’
Lomeli stared at him, incredulous. ‘And he thought it was acceptable for you to continue as an ordained minister?’
‘He left it up to me. We prayed together in his room for guidance. Eventually I decided to have the surgery and to leave the ministry. But the night before I was due to fly to Switzerland, I changed my mind. I am what God made me, Your Eminence. It seemed to me more of a sin to correct His handiwork than to leave my body as it was. So I cancelled my appointment and returned to Baghdad.’
‘And the Holy Father was content to allow that?’
‘One must assume so. After all, he made me a cardinal in pectore in full knowledge of who I am.’
Lomeli cried out, ‘Then he must have gone mad!’