On a microscopic level- the size of the AIDS virus is many times smaller than the microscopic holes in the latex. The sperm are too big to pass through, but the AIDS virus can. One more point- the condoms they try to send to the 3rd world company are the eqivelent of “2nd quality”. They cannot be sold in the US for this reason, therefore, they are even LESS effective.
One more thing no one in the 1st world contries wants to consider, to the average African man, using a condom is a blow to his manly mandood self-image. This leads to very inconsistant use, but the detremantal psycological effect of further saturating the country in sex still takes place. The same as condom distribution programs in schools actually INCREASES the amount of sex by the students, as well as increases the pregnancy rate.
The only African country that has REDUCED the # of AIDS patients is Uganda, which has had a country wide abstenance and monogamy campaign going on for quite some time. This has made PP and the like FURIOUS, and they are pushing HARD to get condoms in there. Uganda also has a reasonably high percentage of Catholics (for an African nation) and I think that the “key” to getting PP’s condoms into Africa is to convince the African bishops it’s ok for AIDS prevention. -There goes the abstenence program in Uganda. PP wins, at the cost of millions more AIDS cases.