What the pope said is that a prostitute using a condom might be the beginning of an attempt to take more responsibility.
But he said condoms are not the means to deal with the AIDS crisis.
Don't believe the hype.
It wouldn't be the first time condoms were okayed for any purpose. Some time ago, some nuns in ex-Yugoslavia were allowed to carry condoms in case of rape. Rape is not sexual intercourse, therefore condoms are not contraception in this context, but self-protection.
The pope's words on the condom issue:
There may be a basis in the case of some individuals, as perhaps when a male prostitute uses a condom, where this can be a first step in the direction of a moralization, a first assumption of responsibility, on the way toward recovering an awareness that not everything is allowed and that one cannot do whatever one wants. But it is not really the way to deal with the evil of HIV infection. That can really lie only in a humanization of sexuality.
So there may be a case to say that condoms are first step towards moralization.
That's hardly blanket approval for condoms for prostitutes.