The Wisdom of Whores

Today I watched a thought provoking interview with the epidemiologist and journalist Elizabeth Pisani on the BBC’s HardTalk programme (follow link to watch the interview.
Ms Pisani has worked with AIDS charities and NGOs for many years and has written, for some, a controversial book on the subject, The Wisdom of Whores.
During the interview and in her book she draws some thought provoking conclusions:
There are two major AIDS epidemics in the World: Africa (mostly East Africa) and the rest of the World.
The two epidemics are differentiated by the way they are spread; in Africa mostly by unprotected sex in the general population and in the rest of the World, by drug users sharing dirty needles, unprotected sex amongst gay men, and unprotected sex between sex workers and their clients.
AIDS is more infectious during its early stages, this attribute explains (according to Ms Pisani) the widespread incidence of AIDS in Africa That is to say, because Africans tend to be more sexually active and have more partners, they are therefore more likely to spread AIDS during unprotected intercourse.
Pisani’s main point, I understand is that getting infected with AIDS is mostly a matter of personal choice: use a condom during sex or clean needle for injecting drugs and you won’t get infected.
She questions the use of the high spending of governments and charities on AIDS prevention, when the at risk groups already know the dangers and how to avoid contracting AIDS.