Regarding the Pope's recent comments on the use of condoms and AIDS.
The Pope is in no way endorsing condoms - even in exceptional cases. He 's merely stating that it could be the first step of a particular individual to realise that their action is indeed wrong.
His example of a male prostitute is very intentional. The Church doesn't believe that male prostitution is a good thing. Hence, the church is not going to endorse anything that would facilitate that behaviour even if it's with the good intention of protecting one's self or another (i.e. from contacting AIDS). That good intention doesn't change the nature of the behaviour itself.